From 20eade824f3093a14459eb086d43692353249f21 Mon Sep 17 00:00:00 2001
From: Devin Matte <devinmatte@gmail.com>
Date: Mon, 3 Mar 2025 20:00:16 -0500
Subject: [PATCH] Fetch segment speed data from API

---
 common/api/hooks/tripmetrics.ts       |   25 +-
 common/api/tripmetrics.ts             |   18 +-
 common/types/api.ts                   |    7 +-
 modules/speed/map/SegmentSpeedMap.tsx |   26 +-
 modules/speed/map/constants.ts        | 2258 -------------------------
 modules/speed/map/segment.ts          |    4 +-
 server/.chalice/config.json           |    2 +-
 server/.chalice/policy.json           |    1 +
 server/app.py                         |    6 +
 server/chalicelib/dynamo.py           |    8 +-
 server/chalicelib/speed.py            |   20 +
 11 files changed, 99 insertions(+), 2276 deletions(-)
 delete mode 100644 modules/speed/map/constants.ts

diff --git a/common/api/hooks/tripmetrics.ts b/common/api/hooks/tripmetrics.ts
index 7ea5745f7..7cb60dbba 100644
--- a/common/api/hooks/tripmetrics.ts
+++ b/common/api/hooks/tripmetrics.ts
@@ -1,7 +1,14 @@
 import { useQuery } from '@tanstack/react-query';
-import type { FetchDeliveredTripMetricsOptions } from '../../types/api';
-import { FIVE_MINUTES } from '../../constants/time';
-import { fetchActualTripsByLine, fetchLandingTripMetrics } from '../tripmetrics';
+import type {
+  FetchDeliveredTripMetricsOptions,
+  FetchSegmentTripMetricsOptions,
+} from '../../types/api';
+import { FIVE_MINUTES, THIRTY_MINUTES } from '../../constants/time';
+import {
+  fetchActualTripsByLine,
+  fetchLandingTripMetrics,
+  fetchSegmentTripMetrics,
+} from '../tripmetrics';
 
 export const useDeliveredTripMetrics = (
   options: FetchDeliveredTripMetricsOptions,
@@ -18,3 +25,15 @@ export const useDeliveredTripMetrics = (
 export const useTripMetricsForLanding = () => {
   return useQuery({ queryKey: ['landingTrips'], queryFn: () => fetchLandingTripMetrics() });
 };
+
+export const useSegmentTripMetricsData = (
+  options: FetchSegmentTripMetricsOptions,
+  enabled: boolean = true
+) => {
+  return useQuery({
+    queryKey: ['segmentTripMetrics', options],
+    queryFn: () => fetchSegmentTripMetrics(options),
+    enabled: enabled && !!options.date,
+    staleTime: THIRTY_MINUTES,
+  });
+};
diff --git a/common/api/tripmetrics.ts b/common/api/tripmetrics.ts
index e7fb810e2..dab1e1d4c 100644
--- a/common/api/tripmetrics.ts
+++ b/common/api/tripmetrics.ts
@@ -1,4 +1,8 @@
-import type { FetchDeliveredTripMetricsOptions } from '../types/api';
+import type { SpeedPairData } from '../../modules/speed/map/segment';
+import type {
+  FetchDeliveredTripMetricsOptions,
+  FetchSegmentTripMetricsOptions,
+} from '../types/api';
 import { FetchDeliveredTripMetricsParams } from '../types/api';
 import type { DeliveredTripMetrics } from '../types/dataPoints';
 import type { Line } from '../types/lines';
@@ -20,3 +24,15 @@ export const fetchLandingTripMetrics = (): Promise<{ [key in Line]: DeliveredTri
   const tripMetricsURL = new URL(`/static/landing/trip_metrics.json`, window.location.origin);
   return fetch(tripMetricsURL.toString()).then((resp) => resp.json());
 };
+
+export const fetchSegmentTripMetrics = async (
+  options: FetchSegmentTripMetricsOptions
+): Promise<SpeedPairData[]> => {
+  if (!options.line) return [];
+
+  return await apiFetch({
+    path: '/api/tripmetrics/segment',
+    options,
+    errorMessage: 'Failed to fetch segment trip metrics',
+  });
+};
diff --git a/common/types/api.ts b/common/types/api.ts
index 6e78bf36b..f84e6cc7e 100644
--- a/common/types/api.ts
+++ b/common/types/api.ts
@@ -1,6 +1,6 @@
 import type { AggType } from '../../modules/speed/constants/speeds';
 import type { ServiceHours, SpeedRestriction } from './dataPoints';
-import type { Line, LineRouteId } from './lines';
+import type { Line, LineRouteId, LineShort } from './lines';
 
 export enum QueryNameKeys {
   traveltimes = 'traveltimes',
@@ -44,6 +44,11 @@ export type FetchSpeedsOptions = {
   line?: Line;
 };
 
+export type FetchSegmentTripMetricsOptions = {
+  date?: string;
+  line: LineShort;
+};
+
 export type FetchDeliveredTripMetricsOptions = {
   agg: AggType;
   start_date?: string;
diff --git a/modules/speed/map/SegmentSpeedMap.tsx b/modules/speed/map/SegmentSpeedMap.tsx
index 1c766afac..b4f0cc1ce 100644
--- a/modules/speed/map/SegmentSpeedMap.tsx
+++ b/modules/speed/map/SegmentSpeedMap.tsx
@@ -12,8 +12,8 @@ import { getSegmentLabelOverrides } from '../../slowzones/map/segment';
 import type { SlowZonesLineName } from '../../slowzones/types';
 import { getStationDistance } from '../../../common/utils/stations';
 import { convertSecondsToMph } from '../../landing/utils';
+import { useSegmentTripMetricsData } from '../../../common/api/hooks/tripmetrics';
 import { segmentStationPairs } from './segment';
-import { TEST_DATA } from './constants';
 import { SpeedSegmentLabel } from './SegmentSpeedLabel';
 import { SegmentSpeedTooltip } from './SegmentSpeedTooltip';
 
@@ -49,16 +49,24 @@ export const SegmentSpeedMap: React.FC<SegmentSpeedMapProps> = ({ lineName, dire
   const { query } = useDelimitatedRoute();
   const { endDate } = query;
 
-  // TODO: Pull from dynamo calculated hourly in data-ingestion
-  const speedData = TEST_DATA.map((data) => {
-    const intervalDistance = getStationDistance(data.from_id, data.to_id);
-
-    return {
-      ...data,
-      speed: convertSecondsToMph(data.travel_time, intervalDistance),
-    };
+  const { data: segmentData } = useSegmentTripMetricsData({
+    date: endDate,
+    line: lineName,
   });
 
+  const speedData = useMemo(
+    () =>
+      segmentData?.map((data) => {
+        const intervalDistance = getStationDistance(data.from_id, data.to_id);
+
+        return {
+          ...data,
+          speed: convertSecondsToMph(data.travel_time, intervalDistance),
+        };
+      }) ?? [],
+    [segmentData]
+  );
+
   const { segments } = useMemo(
     () =>
       segmentStationPairs({
diff --git a/modules/speed/map/constants.ts b/modules/speed/map/constants.ts
deleted file mode 100644
index 8b063acaf..000000000
--- a/modules/speed/map/constants.ts
+++ /dev/null
@@ -1,2258 +0,0 @@
-import type { SpeedPairData } from './segment';
-
-export const TEST_DATA: SpeedPairData[] = [
-  {
-    service_date: '2025-02-24',
-    travel_time: 16.0,
-    route: 'Blue',
-    from_id: 'place-bomnl',
-    to_id: 'place-gover',
-  },
-  {
-    service_date: '2025-02-25',
-    travel_time: 16.0,
-    route: 'Blue',
-    from_id: 'place-bomnl',
-    to_id: 'place-gover',
-  },
-  {
-    service_date: '2025-02-24',
-    travel_time: 36.0,
-    route: 'Blue',
-    from_id: 'place-gover',
-    to_id: 'place-bomnl',
-  },
-  {
-    service_date: '2025-02-25',
-    travel_time: 37.0,
-    route: 'Blue',
-    from_id: 'place-gover',
-    to_id: 'place-bomnl',
-  },
-  {
-    service_date: '2025-02-24',
-    travel_time: 34.0,
-    route: 'Blue',
-    from_id: 'place-gover',
-    to_id: 'place-state',
-  },
-  {
-    service_date: '2025-02-25',
-    travel_time: 34.0,
-    route: 'Blue',
-    from_id: 'place-gover',
-    to_id: 'place-state',
-  },
-  {
-    service_date: '2025-02-24',
-    travel_time: 34.0,
-    route: 'Blue',
-    from_id: 'place-state',
-    to_id: 'place-gover',
-  },
-  {
-    service_date: '2025-02-25',
-    travel_time: 35.0,
-    route: 'Blue',
-    from_id: 'place-state',
-    to_id: 'place-gover',
-  },
-  {
-    service_date: '2025-02-24',
-    travel_time: 30.0,
-    route: 'Blue',
-    from_id: 'place-state',
-    to_id: 'place-aqucl',
-  },
-  {
-    service_date: '2025-02-25',
-    travel_time: 31.0,
-    route: 'Blue',
-    from_id: 'place-state',
-    to_id: 'place-aqucl',
-  },
-  {
-    service_date: '2025-02-24',
-    travel_time: 29.0,
-    route: 'Blue',
-    from_id: 'place-aqucl',
-    to_id: 'place-state',
-  },
-  {
-    service_date: '2025-02-25',
-    travel_time: 30.0,
-    route: 'Blue',
-    from_id: 'place-aqucl',
-    to_id: 'place-state',
-  },
-  {
-    service_date: '2025-02-24',
-    travel_time: 109.0,
-    route: 'Blue',
-    from_id: 'place-aqucl',
-    to_id: 'place-mvbcl',
-  },
-  {
-    service_date: '2025-02-25',
-    travel_time: 109.0,
-    route: 'Blue',
-    from_id: 'place-aqucl',
-    to_id: 'place-mvbcl',
-  },
-  {
-    service_date: '2025-02-24',
-    travel_time: 90.0,
-    route: 'Blue',
-    from_id: 'place-mvbcl',
-    to_id: 'place-aqucl',
-  },
-  {
-    service_date: '2025-02-25',
-    travel_time: 90.0,
-    route: 'Blue',
-    from_id: 'place-mvbcl',
-    to_id: 'place-aqucl',
-  },
-  {
-    service_date: '2025-02-24',
-    travel_time: 81.0,
-    route: 'Blue',
-    from_id: 'place-mvbcl',
-    to_id: 'place-aport',
-  },
-  {
-    service_date: '2025-02-25',
-    travel_time: 81.0,
-    route: 'Blue',
-    from_id: 'place-mvbcl',
-    to_id: 'place-aport',
-  },
-  {
-    service_date: '2025-02-24',
-    travel_time: 98.0,
-    route: 'Blue',
-    from_id: 'place-aport',
-    to_id: 'place-mvbcl',
-  },
-  {
-    service_date: '2025-02-25',
-    travel_time: 99.0,
-    route: 'Blue',
-    from_id: 'place-aport',
-    to_id: 'place-mvbcl',
-  },
-  {
-    service_date: '2025-02-24',
-    travel_time: 59.0,
-    route: 'Blue',
-    from_id: 'place-aport',
-    to_id: 'place-wimnl',
-  },
-  {
-    service_date: '2025-02-25',
-    travel_time: 59.0,
-    route: 'Blue',
-    from_id: 'place-aport',
-    to_id: 'place-wimnl',
-  },
-  {
-    service_date: '2025-02-24',
-    travel_time: 56.5,
-    route: 'Blue',
-    from_id: 'place-wimnl',
-    to_id: 'place-aport',
-  },
-  {
-    service_date: '2025-02-25',
-    travel_time: 56.0,
-    route: 'Blue',
-    from_id: 'place-wimnl',
-    to_id: 'place-aport',
-  },
-  {
-    service_date: '2025-02-24',
-    travel_time: 108.0,
-    route: 'Blue',
-    from_id: 'place-wimnl',
-    to_id: 'place-orhte',
-  },
-  {
-    service_date: '2025-02-25',
-    travel_time: 108.0,
-    route: 'Blue',
-    from_id: 'place-wimnl',
-    to_id: 'place-orhte',
-  },
-  {
-    service_date: '2025-02-24',
-    travel_time: 104.0,
-    route: 'Blue',
-    from_id: 'place-orhte',
-    to_id: 'place-wimnl',
-  },
-  {
-    service_date: '2025-02-25',
-    travel_time: 105.0,
-    route: 'Blue',
-    from_id: 'place-orhte',
-    to_id: 'place-wimnl',
-  },
-  {
-    service_date: '2025-02-24',
-    travel_time: 58.0,
-    route: 'Blue',
-    from_id: 'place-orhte',
-    to_id: 'place-sdmnl',
-  },
-  {
-    service_date: '2025-02-25',
-    travel_time: 58.0,
-    route: 'Blue',
-    from_id: 'place-orhte',
-    to_id: 'place-sdmnl',
-  },
-  {
-    service_date: '2025-02-24',
-    travel_time: 61.0,
-    route: 'Blue',
-    from_id: 'place-sdmnl',
-    to_id: 'place-orhte',
-  },
-  {
-    service_date: '2025-02-25',
-    travel_time: 61.0,
-    route: 'Blue',
-    from_id: 'place-sdmnl',
-    to_id: 'place-orhte',
-  },
-  {
-    service_date: '2025-02-24',
-    travel_time: 47.0,
-    route: 'Blue',
-    from_id: 'place-sdmnl',
-    to_id: 'place-bmmnl',
-  },
-  {
-    service_date: '2025-02-25',
-    travel_time: 47.0,
-    route: 'Blue',
-    from_id: 'place-sdmnl',
-    to_id: 'place-bmmnl',
-  },
-  {
-    service_date: '2025-02-24',
-    travel_time: 46.0,
-    route: 'Blue',
-    from_id: 'place-bmmnl',
-    to_id: 'place-sdmnl',
-  },
-  {
-    service_date: '2025-02-25',
-    travel_time: 46.5,
-    route: 'Blue',
-    from_id: 'place-bmmnl',
-    to_id: 'place-sdmnl',
-  },
-  {
-    service_date: '2025-02-24',
-    travel_time: 73.5,
-    route: 'Blue',
-    from_id: 'place-bmmnl',
-    to_id: 'place-rbmnl',
-  },
-  {
-    service_date: '2025-02-25',
-    travel_time: 74.0,
-    route: 'Blue',
-    from_id: 'place-bmmnl',
-    to_id: 'place-rbmnl',
-  },
-  {
-    service_date: '2025-02-24',
-    travel_time: 69.0,
-    route: 'Blue',
-    from_id: 'place-rbmnl',
-    to_id: 'place-bmmnl',
-  },
-  {
-    service_date: '2025-02-25',
-    travel_time: 70.0,
-    route: 'Blue',
-    from_id: 'place-rbmnl',
-    to_id: 'place-bmmnl',
-  },
-  {
-    service_date: '2025-02-24',
-    travel_time: 78.5,
-    route: 'Blue',
-    from_id: 'place-rbmnl',
-    to_id: 'place-wondl',
-  },
-  {
-    service_date: '2025-02-25',
-    travel_time: 75.0,
-    route: 'Blue',
-    from_id: 'place-rbmnl',
-    to_id: 'place-wondl',
-  },
-  {
-    service_date: '2025-02-24',
-    travel_time: 35.0,
-    route: 'Blue',
-    from_id: 'place-wondl',
-    to_id: 'place-rbmnl',
-  },
-  {
-    service_date: '2025-02-25',
-    travel_time: 35.0,
-    route: 'Blue',
-    from_id: 'place-wondl',
-    to_id: 'place-rbmnl',
-  },
-  {
-    service_date: '2025-02-24',
-    travel_time: 117.5,
-    route: 'Green',
-    from_id: 'place-kencl',
-    to_id: 'place-hymnl',
-  },
-  {
-    service_date: '2025-02-25',
-    travel_time: 120.0,
-    route: 'Green',
-    from_id: 'place-kencl',
-    to_id: 'place-hymnl',
-  },
-  {
-    service_date: '2025-02-24',
-    travel_time: 142.0,
-    route: 'Green',
-    from_id: 'place-kencl',
-    to_id: 'place-fenwy',
-  },
-  {
-    service_date: '2025-02-25',
-    travel_time: 143.0,
-    route: 'Green',
-    from_id: 'place-kencl',
-    to_id: 'place-fenwy',
-  },
-  {
-    service_date: '2025-02-24',
-    travel_time: 109.0,
-    route: 'Green',
-    from_id: 'place-hymnl',
-    to_id: 'place-coecl',
-  },
-  {
-    service_date: '2025-02-25',
-    travel_time: 107.0,
-    route: 'Green',
-    from_id: 'place-hymnl',
-    to_id: 'place-coecl',
-  },
-  {
-    service_date: '2025-02-24',
-    travel_time: 117.0,
-    route: 'Green',
-    from_id: 'place-hymnl',
-    to_id: 'place-kencl',
-  },
-  {
-    service_date: '2025-02-25',
-    travel_time: 116.0,
-    route: 'Green',
-    from_id: 'place-hymnl',
-    to_id: 'place-kencl',
-  },
-  {
-    service_date: '2025-02-24',
-    travel_time: 66.0,
-    route: 'Green',
-    from_id: 'place-coecl',
-    to_id: 'place-armnl',
-  },
-  {
-    service_date: '2025-02-25',
-    travel_time: 67.0,
-    route: 'Green',
-    from_id: 'place-coecl',
-    to_id: 'place-armnl',
-  },
-  {
-    service_date: '2025-02-24',
-    travel_time: 100.5,
-    route: 'Green',
-    from_id: 'place-coecl',
-    to_id: 'place-hymnl',
-  },
-  {
-    service_date: '2025-02-25',
-    travel_time: 99.0,
-    route: 'Green',
-    from_id: 'place-coecl',
-    to_id: 'place-hymnl',
-  },
-  {
-    service_date: '2025-02-24',
-    travel_time: 118.0,
-    route: 'Green',
-    from_id: 'place-armnl',
-    to_id: 'place-boyls',
-  },
-  {
-    service_date: '2025-02-25',
-    travel_time: 120.0,
-    route: 'Green',
-    from_id: 'place-armnl',
-    to_id: 'place-boyls',
-  },
-  {
-    service_date: '2025-02-24',
-    travel_time: 67.0,
-    route: 'Green',
-    from_id: 'place-armnl',
-    to_id: 'place-coecl',
-  },
-  {
-    service_date: '2025-02-25',
-    travel_time: 60.0,
-    route: 'Green',
-    from_id: 'place-armnl',
-    to_id: 'place-coecl',
-  },
-  {
-    service_date: '2025-02-24',
-    travel_time: 66.0,
-    route: 'Green',
-    from_id: 'place-boyls',
-    to_id: 'place-pktrm',
-  },
-  {
-    service_date: '2025-02-25',
-    travel_time: 67.0,
-    route: 'Green',
-    from_id: 'place-boyls',
-    to_id: 'place-pktrm',
-  },
-  {
-    service_date: '2025-02-24',
-    travel_time: 111.0,
-    route: 'Green',
-    from_id: 'place-boyls',
-    to_id: 'place-armnl',
-  },
-  {
-    service_date: '2025-02-25',
-    travel_time: 107.0,
-    route: 'Green',
-    from_id: 'place-boyls',
-    to_id: 'place-armnl',
-  },
-  {
-    service_date: '2025-02-24',
-    travel_time: 66.0,
-    route: 'Green',
-    from_id: 'place-river',
-    to_id: 'place-woodl',
-  },
-  {
-    service_date: '2025-02-25',
-    travel_time: 63.0,
-    route: 'Green',
-    from_id: 'place-river',
-    to_id: 'place-woodl',
-  },
-  {
-    service_date: '2025-02-24',
-    travel_time: 93.0,
-    route: 'Green',
-    from_id: 'place-woodl',
-    to_id: 'place-waban',
-  },
-  {
-    service_date: '2025-02-25',
-    travel_time: 91.0,
-    route: 'Green',
-    from_id: 'place-woodl',
-    to_id: 'place-waban',
-  },
-  {
-    service_date: '2025-02-24',
-    travel_time: 96.0,
-    route: 'Green',
-    from_id: 'place-woodl',
-    to_id: 'place-river',
-  },
-  {
-    service_date: '2025-02-25',
-    travel_time: 96.0,
-    route: 'Green',
-    from_id: 'place-woodl',
-    to_id: 'place-river',
-  },
-  {
-    service_date: '2025-02-24',
-    travel_time: 85.0,
-    route: 'Green',
-    from_id: 'place-waban',
-    to_id: 'place-eliot',
-  },
-  {
-    service_date: '2025-02-25',
-    travel_time: 84.0,
-    route: 'Green',
-    from_id: 'place-waban',
-    to_id: 'place-eliot',
-  },
-  {
-    service_date: '2025-02-24',
-    travel_time: 90.0,
-    route: 'Green',
-    from_id: 'place-waban',
-    to_id: 'place-woodl',
-  },
-  {
-    service_date: '2025-02-25',
-    travel_time: 89.0,
-    route: 'Green',
-    from_id: 'place-waban',
-    to_id: 'place-woodl',
-  },
-  {
-    service_date: '2025-02-24',
-    travel_time: 96.0,
-    route: 'Green',
-    from_id: 'place-eliot',
-    to_id: 'place-newtn',
-  },
-  {
-    service_date: '2025-02-25',
-    travel_time: 94.0,
-    route: 'Green',
-    from_id: 'place-eliot',
-    to_id: 'place-newtn',
-  },
-  {
-    service_date: '2025-02-24',
-    travel_time: 84.0,
-    route: 'Green',
-    from_id: 'place-eliot',
-    to_id: 'place-waban',
-  },
-  {
-    service_date: '2025-02-25',
-    travel_time: 82.0,
-    route: 'Green',
-    from_id: 'place-eliot',
-    to_id: 'place-waban',
-  },
-  {
-    service_date: '2025-02-24',
-    travel_time: 86.0,
-    route: 'Green',
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-  {
-    service_date: '2025-02-24',
-    travel_time: 148.0,
-    route: 'Red',
-    from_id: 'place-fldcr',
-    to_id: 'place-shmnl',
-  },
-  {
-    service_date: '2025-02-25',
-    travel_time: 148.0,
-    route: 'Red',
-    from_id: 'place-fldcr',
-    to_id: 'place-shmnl',
-  },
-  {
-    service_date: '2025-02-24',
-    travel_time: 99.0,
-    route: 'Red',
-    from_id: 'place-smmnl',
-    to_id: 'place-asmnl',
-  },
-  {
-    service_date: '2025-02-25',
-    travel_time: 99.0,
-    route: 'Red',
-    from_id: 'place-smmnl',
-    to_id: 'place-asmnl',
-  },
-  {
-    service_date: '2025-02-24',
-    travel_time: 48.0,
-    route: 'Red',
-    from_id: 'place-smmnl',
-    to_id: 'place-fldcr',
-  },
-  {
-    service_date: '2025-02-25',
-    travel_time: 47.0,
-    route: 'Red',
-    from_id: 'place-smmnl',
-    to_id: 'place-fldcr',
-  },
-  {
-    service_date: '2025-02-24',
-    travel_time: 58.0,
-    route: 'Red',
-    from_id: 'place-asmnl',
-    to_id: 'place-smmnl',
-  },
-  {
-    service_date: '2025-02-25',
-    travel_time: 56.0,
-    route: 'Red',
-    from_id: 'place-asmnl',
-    to_id: 'place-smmnl',
-  },
-  {
-    service_date: '2025-02-24',
-    travel_time: 330.5,
-    route: 'Red',
-    from_id: 'place-jfk',
-    to_id: 'place-nqncy',
-  },
-  {
-    service_date: '2025-02-25',
-    travel_time: 330.0,
-    route: 'Red',
-    from_id: 'place-jfk',
-    to_id: 'place-nqncy',
-  },
-  {
-    service_date: '2025-02-24',
-    travel_time: 104.0,
-    route: 'Red',
-    from_id: 'place-jfk',
-    to_id: 'place-andrw',
-  },
-  {
-    service_date: '2025-02-25',
-    travel_time: 104.0,
-    route: 'Red',
-    from_id: 'place-jfk',
-    to_id: 'place-andrw',
-  },
-  {
-    service_date: '2025-02-24',
-    travel_time: 68.0,
-    route: 'Red',
-    from_id: 'place-nqncy',
-    to_id: 'place-wlsta',
-  },
-  {
-    service_date: '2025-02-25',
-    travel_time: 67.0,
-    route: 'Red',
-    from_id: 'place-nqncy',
-    to_id: 'place-wlsta',
-  },
-  {
-    service_date: '2025-02-24',
-    travel_time: 330.0,
-    route: 'Red',
-    from_id: 'place-nqncy',
-    to_id: 'place-jfk',
-  },
-  {
-    service_date: '2025-02-25',
-    travel_time: 328.0,
-    route: 'Red',
-    from_id: 'place-nqncy',
-    to_id: 'place-jfk',
-  },
-  {
-    service_date: '2025-02-24',
-    travel_time: 133.5,
-    route: 'Red',
-    from_id: 'place-wlsta',
-    to_id: 'place-qnctr',
-  },
-  {
-    service_date: '2025-02-25',
-    travel_time: 137.0,
-    route: 'Red',
-    from_id: 'place-wlsta',
-    to_id: 'place-qnctr',
-  },
-  {
-    service_date: '2025-02-24',
-    travel_time: 72.0,
-    route: 'Red',
-    from_id: 'place-wlsta',
-    to_id: 'place-nqncy',
-  },
-  {
-    service_date: '2025-02-25',
-    travel_time: 72.0,
-    route: 'Red',
-    from_id: 'place-wlsta',
-    to_id: 'place-nqncy',
-  },
-  {
-    service_date: '2025-02-24',
-    travel_time: 123.0,
-    route: 'Red',
-    from_id: 'place-qnctr',
-    to_id: 'place-qamnl',
-  },
-  {
-    service_date: '2025-02-25',
-    travel_time: 122.0,
-    route: 'Red',
-    from_id: 'place-qnctr',
-    to_id: 'place-qamnl',
-  },
-  {
-    service_date: '2025-02-24',
-    travel_time: 154.0,
-    route: 'Red',
-    from_id: 'place-qnctr',
-    to_id: 'place-wlsta',
-  },
-  {
-    service_date: '2025-02-25',
-    travel_time: 155.0,
-    route: 'Red',
-    from_id: 'place-qnctr',
-    to_id: 'place-wlsta',
-  },
-  {
-    service_date: '2025-02-24',
-    travel_time: 248.5,
-    route: 'Red',
-    from_id: 'place-qamnl',
-    to_id: 'place-brntn',
-  },
-  {
-    service_date: '2025-02-25',
-    travel_time: 252.0,
-    route: 'Red',
-    from_id: 'place-qamnl',
-    to_id: 'place-brntn',
-  },
-  {
-    service_date: '2025-02-24',
-    travel_time: 124.0,
-    route: 'Red',
-    from_id: 'place-qamnl',
-    to_id: 'place-qnctr',
-  },
-  {
-    service_date: '2025-02-25',
-    travel_time: 123.0,
-    route: 'Red',
-    from_id: 'place-qamnl',
-    to_id: 'place-qnctr',
-  },
-  {
-    service_date: '2025-02-24',
-    travel_time: 186.0,
-    route: 'Red',
-    from_id: 'place-brntn',
-    to_id: 'place-qamnl',
-  },
-  {
-    service_date: '2025-02-25',
-    travel_time: 184.0,
-    route: 'Red',
-    from_id: 'place-brntn',
-    to_id: 'place-qamnl',
-  },
-];
diff --git a/modules/speed/map/segment.ts b/modules/speed/map/segment.ts
index 207610156..79ba944b5 100644
--- a/modules/speed/map/segment.ts
+++ b/modules/speed/map/segment.ts
@@ -14,7 +14,7 @@ import type { LineShort } from '../../../common/types/lines';
 import { getStationById } from '../../../common/utils/stations';
 
 export type SpeedPairData = {
-  service_date: string;
+  date: string;
   travel_time: number;
   speed?: number;
   route: LineShort;
@@ -57,7 +57,7 @@ export const segmentStationPairs = (
       speedPairs,
       lineName,
       desiredDate,
-      (segment) => [new Date(segment.service_date), new Date(desiredDate)],
+      (segment) => [new Date(segment.date), new Date(desiredDate)],
       (segment) => segment.route
     ),
     (segment) => getStationById(segment.from_id),
diff --git a/server/.chalice/config.json b/server/.chalice/config.json
index ac3e048a3..424006925 100644
--- a/server/.chalice/config.json
+++ b/server/.chalice/config.json
@@ -5,7 +5,7 @@
   "minimum_compression_size": 1000,
   "lambda_timeout": 30,
   "lambda_memory_size": 1024,
-  "layers": ["arn:aws:lambda:us-east-1:464622532012:layer:Datadog-Extension:68"],
+  "layers": ["arn:aws:lambda:us-east-1:464622532012:layer:Datadog-Extension:70"],
   "stages": {
     "production": {
       "api_gateway_stage": "production",
diff --git a/server/.chalice/policy.json b/server/.chalice/policy.json
index d848b9d1b..dbbd28010 100644
--- a/server/.chalice/policy.json
+++ b/server/.chalice/policy.json
@@ -27,6 +27,7 @@
         "arn:aws:dynamodb:*:*:table/ScheduledServiceDaily",
         "arn:aws:dynamodb:*:*:table/Ridership",
         "arn:aws:dynamodb:*:*:table/SpeedRestrictions",
+        "arn:aws:dynamodb:*:*:table/SegmentTravelTimes",
         "arn:aws:dynamodb:*:*:table/TimePredictions",
         "arn:aws:dynamodb:*:*:table/AlertDelaysWeekly"
       ]
diff --git a/server/app.py b/server/app.py
index 83d11fb2d..1d82c03f2 100644
--- a/server/app.py
+++ b/server/app.py
@@ -177,6 +177,12 @@ def get_trips_by_line():
     return json.dumps(response, indent=4, sort_keys=True)
 
 
+@app.route("/api/tripmetrics/segment", cors=cors_config)
+def get_trips_by_segment():
+    response = speed.query_speed_segment(app.current_request.query_params)
+    return json.dumps(response, indent=4, sort_keys=True)
+
+
 @app.route("/api/scheduledservice", cors=cors_config)
 def get_scheduled_service():
     query = app.current_request.query_params
diff --git a/server/chalicelib/dynamo.py b/server/chalicelib/dynamo.py
index 73b4703eb..5e27a7715 100644
--- a/server/chalicelib/dynamo.py
+++ b/server/chalicelib/dynamo.py
@@ -10,12 +10,18 @@
 dynamodb = boto3.resource("dynamodb")
 
 
-def query_daily_trips_on_route(table_name: str, route, start_date: str | date, end_date: str | date):
+def query_daily_trips_on_route(table_name: str, route: str, start_date: str | date, end_date: str | date):
     table = dynamodb.Table(table_name)
     response = table.query(KeyConditionExpression=Key("route").eq(route) & Key("date").between(start_date, end_date))
     return ddb_json.loads(response["Items"])
 
 
+def query_segment_tts_on_route(route: str, date: str | date):
+    table = dynamodb.Table("SegmentTravelTimes")
+    response = table.query(KeyConditionExpression=Key("route").eq(route) & Key("date_stop_pair").begins_with(date))
+    return ddb_json.loads(response["Items"])
+
+
 def query_daily_trips_on_line(table_name: str, line: str, start_date: str | date, end_date: str | date):
     route_keys = constants.LINE_TO_ROUTE_MAP[line]
     with concurrent.futures.ThreadPoolExecutor(max_workers=4) as executor:
diff --git a/server/chalicelib/speed.py b/server/chalicelib/speed.py
index e8f738f7e..644187dcc 100644
--- a/server/chalicelib/speed.py
+++ b/server/chalicelib/speed.py
@@ -14,6 +14,11 @@ class TripMetricsByLineParams(TypedDict):
     line: str
 
 
+class TripMetricsByLineAndDateParams(TypedDict):
+    date: str | date
+    line: str
+
+
 # Delta values put limits on the numbers of days for which data that can be requested. For each table it is approximately 150 entries.
 AGG_TO_CONFIG_MAP = {
     "daily": {"table_name": "DeliveredTripMetrics", "delta": 150},
@@ -74,6 +79,21 @@ def trip_metrics_by_line(params: TripMetricsByLineParams):
     return dynamo.query_agg_trip_metrics(start_date, end_date, config["table_name"], line)
 
 
+def query_speed_segment(params: TripMetricsByLineAndDateParams):
+    try:
+        date = params["date"]
+        line = params["line"]
+        if line not in ["Red", "Blue", "Green", "Orange", "Mattapan"]:
+            raise BadRequestError("Invalid Line key.")
+    except KeyError:
+        raise BadRequestError("Missing or invalid parameters.")
+    actual_trips = dynamo.query_segment_tts_on_route(line, date)
+    for trip in actual_trips:
+        if "date_stop_pair" in trip:
+            del trip["date_stop_pair"]
+    return actual_trips
+
+
 def is_invalid_range(start_date, end_date, max_delta):
     """Check if number of requested entries is more than maximum for the table"""
     start_datetime = datetime.strptime(start_date, DATE_FORMAT_BACKEND)