LANSING, Mich. This map shows the Car Dependency Index (CDI) for the Greater Lansing area (Ingham, Eaton, and Clinton counties), following the methodology in Campanelli et al. (2026). Each hexagon is an origin. Its color reflects how much slower transit is than driving to reach everyday destinations within 30 minutes at Tuesday 9 AM. Paler hexes are relatively less car-dependent (transit closer to car); deep red hexes are car-only.
The Campanelli et al. preprint “Car Dependency in Urban Accessibility” compares accessibility by car versus transit. This map computes a CDI for each H3 r8 hex (about 0.7 km², 530 m edge) covering the tri-county Lansing metro.
CDI = (T_transit − T_car) / (T_transit + T_car), using the median travel time to all reachable destinations per mode. 0 means transit is as fast as a car. +1 means transit is hopeless. Lansing’s tri-county median is about 0.77 (transit roughly 7x slower); even downtown only reaches about 0.62 (roughly 4x slower). We use a sequential pale-to-maroon ramp with decile breaks: Lansing has no transit-competitive hexes, so a diverging blue/red scale would mislead.The ACS no-vehicle share is the comparison metric, computed on the same hexes. Switch between the two with the chip row above the map.
Hover any hex for a quick read; click it for the full panel: its CDI, how many times slower transit is than driving, how many destinations each mode reaches in 30 minutes (and by category), the no-vehicle share of its tract, and the straight-line distance to the nearest CATA stop. Use the chip row to recolor the same hexes by either the modeled CDI or the ACS no-vehicle share.