TODO - GUI and UX

Quick n easy

try showing traffic signals by little boxes at the end of lanes
- red circle means right turn on red OK, red right arrow means nope, green means normal turns ok, green arrow means protected left, crosswalk hand or stick figure
- Circle::new radius and pt project_away should take meters type
if a lane could feasibly have multiple turn options but doesnt, print "ONLY"
color roads as solid black when zoomed out, and make intersections similar (except for stop sign / signal)
audit all panics
tune text color, size, padding
sort the top menus
click cycle diagram to edit duration
lane edit validity
make it easy to see current lane when changing it

revamp stop sign editor
toggle rewind mode
- sim stuff feels like a modal menu that's kinda omniprescent, but gets hidden sometimes
yellow or flashing red/yellow for yields
text box entry: highlight char looks like replace mode; draw it btwn chars

render overlapping peds reasonably
draw moving / blocked colors (gradually more red as they wait longer)
render cars with textures?
rooftops
- https://thumbs.dreamstime.com/b/top-view-city-street-asphalt-transport-people-walking-down-sidewalk-intersecting-road-pedestrian-81034411.jpg
- https://thumbs.dreamstime.com/z/top-view-city-seamless-pattern-streets-roads-houses-cars-68652655.jpg
general inspiration
- https://gifer.com/en/2svr
- https://www.fhwa.dot.gov/publications/research/safety/05078/images/fig6.gif
color tuning
- neutral (white or offwhite) color and make noncritical info close to that. http://davidjohnstone.net/pages/lch-lab-colour-gradient-picker, chroma < 50
use new arrows for drawing...
- triangle and base have a gap; why?!
  - only for turn icons?
  - draw as one polygon when fixed
- dashed thickness is way off
- last dash shouldnt appear?