Paratransit trips take 2x as long as the same trip by car, with 4x the time variability, trapping disabled riders in transit

ADA-mandated paratransit service — the shared-ride, door-to-door service for people who can't use fixed-route transit due to disability — is extraordinarily time-inefficient. A 2024 peer-reviewed study using 2.5 years of data from Denver's Access-a-Ride system found that paratransit trips take nearly twice as long as the equivalent car trip for the same origin-destination pair. Worse, the standard deviation of paratransit trip time is four times that of car trip time, meaning riders can't even plan around the delay because it's wildly unpredictable. A 10-mile trip at 7-8 AM takes about 16 minutes by car with almost no variability, but averages 25 minutes by paratransit with 5% of trips falling completely outside statistical prediction. The real pain isn't abstract. Paratransit riders report missed medical appointments, lost jobs, surgeries that had to be rescheduled, and doctor's office no-show fees — all because the ride was late, went in circles picking up other passengers, or never arrived. Riders must book 1-2 days in advance, and the actual pickup time can be an hour earlier or later than requested. A rider with a 9 AM doctor's appointment might be told their window is 7:30-8:30 AM, then get picked up at 8:25, routed through three other pickups, and arrive at 9:40. The study found this time penalty is worse for women, older adults, cash-paying customers, and those making shorter trips — meaning the people most dependent on the service are most punished by it. This persists because paratransit's shared-ride model creates an inherent routing optimization problem that agencies solve poorly. Each vehicle serves multiple riders going to different destinations, and the routing software must balance vehicle capacity, time windows, and geographic spread. Most agencies use legacy routing systems that optimize for vehicle utilization (filling seats) rather than rider experience (minimizing detours). Modern on-demand algorithms from companies like Via have shown 30-40% improvements in trip time, but agencies are locked into multi-year contracts with incumbent vendors, and switching routing systems requires retraining dispatchers, recertifying vehicles, and navigating procurement rules that favor the lowest bidder over the best technology.