TODO - Core gameplay

Example use cases
- montlake/520 turn restrictions with pedestrian scramble
  - need intersection merging before this is understandable
- close interior neighborhoods to most cars (except for src/dst), see how traffic restricted to arterials would work
  - puzzle: with only X miles of retained road, where would you leave them? what roads would go away?
- create a bike network with minimal hills, dedicated roads, minimal crossings
easter eggs
- name agents, with some good names scattered in (Dustin Carlino, Dustin Bikelino, Dustin Buslino...)

Tutorial

parking vs bus tutorial level
- big vertical road. some neighborhoods off to the side. everyone trying to go nrth or south. one driving, one parkign lane. a bus that makes a loop. some horizontal roads connected to borders that force the vertical road to not be fast. just make a dedicated bus lane! oops,except some of the bus stops are at narrow places, so traffic has to slow down anyway for the bus. maybe there's a bypass road through a neighborhood?
introduce elements gradually... fix a silly traffic signal with just cars, then add peds and bikes...
spawn cars somewhere
run sim, pause, change speed, reset

Light rail and downtown bus tunnel
more accurate pedestrian speed, and randomized speeds
seed parked cars in neighborhood with no owner or a far-away owner, to model reasonable starting state
outgoing border nodes can throttle to simulate traffic downstream