Travel Mode Split Calculator

The density-driven reduction is capped at 30 percentage points regardless of how high density climbs beyond the density where that cap is reached. This mirrors how real mode-share models often show diminishing returns from density alone once an area is already very dense, though the exact cap value here is a simplification rather than a measured regional relationship.

Within this calculator's model, yes — Auto Mode Share falls as Daily Parking Cost rises, up to a maximum 15-percentage-point reduction from that factor alone. Real-world parking pricing effects depend heavily on whether viable transit or biking alternatives actually exist nearby, which this calculator represents only through the separate Transit Access and Bike Infrastructure inputs.

Walk Share isn't set directly — it's whatever remains of the non-auto share after Transit Share and Bicycle Share are allocated in proportion to Transit Access and Bike Infrastructure, using a fixed baseline weight that represents typical walking demand. Areas with low transit access and little bike infrastructure end up assigning more of the remaining share to walking by default. Note that the three non-auto modes compete for a fixed remainder: adding bike infrastructure raises Bicycle Share and simultaneously lowers Transit Share and Walk Share, because it raises bike's weight in the proportional split faster than it shrinks the auto share. That is an artefact of splitting one remainder proportionally, not a prediction that bike lanes reduce transit ridership.

Auto Mode Share is computed first and subtracted from 100% to get the remaining share, and Transit, Bicycle, and Walk are then split proportionally out of exactly that remainder rather than calculated independently. That structure guarantees the four outputs always sum to the full 100%, by construction rather than by coincidence.