Different streets, with traffic that keeps moving

I gave the local cities a repeatable mix of boulevards, narrower streets, cycle lanes, and parking layouts, with 20 moving cars by default. I also worked on blocked roads and junction queues so cars can make progress while still yielding to the traffic and rider in their path.

Changelog

• Cities now combine boulevards, narrower streets, cycle lanes and parking layouts in a repeatable mix that varies by seed.
• Every map starts with a default of 20 moving cars.
• Cars can drive around blocked roads without being held up by unrelated vehicles behind or beside them.
• Junction queues clear more reliably while cars continue yielding to traffic and the rider in their path.