 3) automated personal rapid transit system, 30 km/h (~8 m/s) speeds, 3 passengers, 3 meter vehicle length, 2.5 m/s braking (1/4 "gee"), 0.01 second reaction time, brake-failure on lead vehicle for 1 m/s slowing, bot 2.5, m/s if lead vehicle breaks.formula_8 of 1.1;

This number is similar to the ones proposed by the Cabinentaxi system, although they predicted that actual use would be much lower.Although PRTs have less passenger seating and speeds, their shorter headways dramatically improve passenger capacity.