Using Metrino suspended podcars as a benchmark, it is estimated that crashes would be reduced by 80%; assaults would be reduced by 50%; amenity can be dramatically improved; congestion would be removed; trips would be 4 times faster; revenue could be $30B/year; there would be a million more jobs; reliability would be created; and CO2 emissions would reduce by 80%. The chart compares existing public transport with suspended podcars. On preliminary inspection, no other alternative comes close to the benefits offered by suspended podcars.
Arterial street amenity has long been the major transport concern by municipalities, second only to funding in a report based on a survey of 60 Mayors and 60 City Engineers. Poor amenity mitigates against parks, gardens and outdoor dining... mainly because of pollution, crash risk and space demands for car parking. Excessive car traffic and speed means that children can no longer play in the street. Noise levels on arterial streets often exceed criteria set for freeways, but there are no remedial options available.
An economic case can be made for metering demand to practical (~90%) capacity, using time savings, reliability, and reduced traffic incidents. At that flow rate, queues clear each signal cycle, and signals can be timed so that platoons pass through each intersection in the peak direction in a smooth flow without stopping, at the speed limit. There is low marginal value for many trips to be made by car, and that value is exceeded by the value of lost time that these trips cause to other traffic.
“Continuous flow” intersections are used in Utah on the Bangerter Highway. They have crossovers on the main approaches to intersections, but not on the side road approaches. This is because federal funding is limited to the highway approaches. Right turn conflicts with opposing traffic are resolved on the main approaches with a “crossover”, saving time lost at the intersection due to one turn phase. These intersections have major improvements in capacity, delay and safety. Crossovers are described elsewhere.