diff --git a/client/src/components/Planner/DayPlanSidebar.tsx b/client/src/components/Planner/DayPlanSidebar.tsx
index 5e6a63a1..91ad626d 100644
--- a/client/src/components/Planner/DayPlanSidebar.tsx
+++ b/client/src/components/Planner/DayPlanSidebar.tsx
@@ -20,7 +20,7 @@ import { useSettingsStore } from '../../store/settingsStore'
 import { useTranslation } from '../../i18n'
 import { isDayInAccommodationRange, getAccommodationAnchors } from '../../utils/dayOrder'
 import {
-  TRANSPORT_TYPES, parseTimeToMinutes, getSpanPhase, getDisplayTimeForDay,
+  TRANSPORT_TYPES, parseTimeToMinutes, getSpanPhase, getDisplayTimeForDay, getTransportRouteEndpoints,
   getTransportForDay as _getTransportForDay, getMergedItems as _getMergedItems,
   type MergedItem,
 } from '../../utils/dayMerge'
@@ -383,10 +383,6 @@ function useDayPlanSidebar(props: DayPlanSidebarProps) {
     if (legsAbortRef.current) legsAbortRef.current.abort()
     if (!selectedDayId || !routeShown) { setRouteLegs({}); setHotelLegs({}); return }
     const merged = mergedItemsMap[selectedDayId] || []
-    const epLoc = (r: any, role: 'from' | 'to'): { lat: number; lng: number } | null => {
-      const e = (r.endpoints || []).find((x: any) => x.role === role)
-      return e && e.lat != null && e.lng != null ? { lat: e.lat, lng: e.lng } : null
-    }
     const runs: { id: number; lat: number; lng: number }[][] = []
     let cur: { id: number; lat: number; lng: number }[] = []
     for (const it of merged) {
@@ -394,7 +390,7 @@ function useDayPlanSidebar(props: DayPlanSidebarProps) {
         cur.push({ id: it.data.id, lat: it.data.place.lat, lng: it.data.place.lng })
       } else if (it.type === 'transport') {
         const r = it.data
-        const from = epLoc(r, 'from'), to = epLoc(r, 'to')
+        const { from, to } = getTransportRouteEndpoints(r, selectedDayId)
         if (from || to) {
           // Located transport: route to its departure point, break the run (the
           // flight/train itself isn't driven), and let its arrival start the next.
diff --git a/client/src/hooks/useRouteCalculation.ts b/client/src/hooks/useRouteCalculation.ts
index 98c8118d..5897b851 100644
--- a/client/src/hooks/useRouteCalculation.ts
+++ b/client/src/hooks/useRouteCalculation.ts
@@ -1,6 +1,7 @@
 import { useState, useCallback, useRef, useEffect, useMemo } from 'react'
 import { useTripStore } from '../store/tripStore'
 import { calculateRouteWithLegs } from '../components/Map/RouteCalculator'
+import { getTransportRouteEndpoints } from '../utils/dayMerge'
 import type { TripStoreState } from '../store/tripStore'
 import type { RouteSegment, RouteResult } from '../types'
 
@@ -53,12 +54,6 @@ export function useRouteCalculation(tripStore: TripStoreState, selectedDayId: nu
       return pos != null
     })
 
-    // The departure/arrival coordinate of a transport, if its endpoints carry one.
-    const epLoc = (r: any, role: 'from' | 'to'): { lat: number; lng: number } | null => {
-      const e = (r.endpoints || []).find((x: any) => x.role === role)
-      return e && e.lat != null && e.lng != null ? { lat: e.lat, lng: e.lng } : null
-    }
-
     // Build a unified list of places + transports sorted by effective position.
     type Entry =
       | { kind: 'place'; lat: number; lng: number; pos: number }
@@ -67,12 +62,15 @@ export function useRouteCalculation(tripStore: TripStoreState, selectedDayId: nu
       ...da.filter(a => a.place?.lat && a.place?.lng).map(a => ({
         kind: 'place' as const, lat: a.place.lat!, lng: a.place.lng!, pos: a.order_index,
       })),
-      ...dayTransports.map(r => ({
-        kind: 'transport' as const,
-        from: epLoc(r, 'from'),
-        to: epLoc(r, 'to'),
-        pos: (r.day_positions?.[dayId] ?? r.day_positions?.[String(dayId)] ?? r.day_plan_position) as number,
-      })),
+      ...dayTransports.map(r => {
+        const { from, to } = getTransportRouteEndpoints(r, dayId)
+        return {
+          kind: 'transport' as const,
+          from,
+          to,
+          pos: (r.day_positions?.[dayId] ?? r.day_positions?.[String(dayId)] ?? r.day_plan_position) as number,
+        }
+      }),
     ].sort((a, b) => a.pos - b.pos)
 
     // Group located places into driving runs.
diff --git a/client/src/utils/dayMerge.test.ts b/client/src/utils/dayMerge.test.ts
index 3e53f9c0..bd21552c 100644
--- a/client/src/utils/dayMerge.test.ts
+++ b/client/src/utils/dayMerge.test.ts
@@ -1,5 +1,5 @@
 import { describe, it, expect } from 'vitest'
-import { parseTimeToMinutes, getSpanPhase, getDisplayTimeForDay, getTransportForDay, getMergedItems } from './dayMerge'
+import { parseTimeToMinutes, getSpanPhase, getTransportRouteEndpoints, getDisplayTimeForDay, getTransportForDay, getMergedItems } from './dayMerge'
 
 describe('parseTimeToMinutes', () => {
   it('parses HH:MM string', () => {
@@ -34,6 +34,38 @@ describe('getSpanPhase', () => {
   })
 })
 
+describe('getTransportRouteEndpoints', () => {
+  const pickup = { role: 'from', lat: 48.1, lng: 11.5 }
+  const dropoff = { role: 'to', lat: 52.5, lng: 13.4 }
+  // A car rental spanning day 1 (pickup) through day 3 (drop-off).
+  const rental = { day_id: 1, end_day_id: 3, endpoints: [pickup, dropoff] }
+
+  it('routes to the pickup only on the start day of a multi-day rental', () => {
+    expect(getTransportRouteEndpoints(rental, 1)).toEqual({ from: { lat: 48.1, lng: 11.5 }, to: null })
+  })
+
+  it('routes from the drop-off only on the end day', () => {
+    expect(getTransportRouteEndpoints(rental, 3)).toEqual({ from: null, to: { lat: 52.5, lng: 13.4 } })
+  })
+
+  it('adds no waypoints on the days in between (regression for #1210)', () => {
+    expect(getTransportRouteEndpoints(rental, 2)).toEqual({ from: null, to: null })
+  })
+
+  it('uses both endpoints for a single-day transport', () => {
+    const sameDay = { day_id: 1, end_day_id: 1, endpoints: [pickup, dropoff] }
+    expect(getTransportRouteEndpoints(sameDay, 1)).toEqual({
+      from: { lat: 48.1, lng: 11.5 },
+      to: { lat: 52.5, lng: 13.4 },
+    })
+  })
+
+  it('returns nulls when the endpoints carry no coordinates', () => {
+    const noCoords = { day_id: 1, end_day_id: 1, endpoints: [{ role: 'from' }, { role: 'to' }] }
+    expect(getTransportRouteEndpoints(noCoords, 1)).toEqual({ from: null, to: null })
+  })
+})
+
 describe('getDisplayTimeForDay', () => {
   const r = { day_id: 1, end_day_id: 3, reservation_time: '2025-01-01T09:00:00', reservation_end_time: '2025-01-03T14:00:00' }
 
diff --git a/client/src/utils/dayMerge.ts b/client/src/utils/dayMerge.ts
index cabd9bbd..8bdda0ff 100644
--- a/client/src/utils/dayMerge.ts
+++ b/client/src/utils/dayMerge.ts
@@ -29,6 +29,33 @@ export function getSpanPhase(
   return 'middle'
 }
 
+/**
+ * The route waypoints a transport contributes on a given day, respecting multi-day spans.
+ * A car rental (or any reservation whose span covers several days) is only routed to on its
+ * pickup day (the departure endpoint) and from on its drop-off day (the arrival endpoint) — on
+ * the days in between you simply hold the vehicle, so it adds no waypoints and must not pull the
+ * route to those points. Single-day transports contribute both endpoints.
+ */
+export function getTransportRouteEndpoints(
+  r: any,
+  dayId: number
+): { from: { lat: number; lng: number } | null; to: { lat: number; lng: number } | null } {
+  const ep = (role: 'from' | 'to'): { lat: number; lng: number } | null => {
+    const e = (r.endpoints || []).find((x: any) => x.role === role)
+    return e && e.lat != null && e.lng != null ? { lat: e.lat, lng: e.lng } : null
+  }
+  switch (getSpanPhase(r, dayId)) {
+    case 'start':
+      return { from: ep('from'), to: null }
+    case 'end':
+      return { from: null, to: ep('to') }
+    case 'middle':
+      return { from: null, to: null }
+    default:
+      return { from: ep('from'), to: ep('to') }
+  }
+}
+
 export function getDisplayTimeForDay(
   r: { day_id?: number | null; end_day_id?: number | null; reservation_time?: string | null; reservation_end_time?: string | null },
   dayId: number