Every block now circulates clockwise so adjacent blocks use opposite
lanes of a shared road, eliminating contra-mão paths. Collision
detection samples bodies more densely (0.35 step, 0.88 lateral
tolerance) to catch near-misses, and corner radii were increased for
smoother turns.
Also adds cosmetic car details — front/rear license plates, side
mirrors with mounting arms, and a roof trim panel — plus updated
traffic-rule screenshots.