Driving restrictions
Motion and distraction gating while the vehicle is in motion. Restricted flows get honest substitutes — not disabled clutter.
Compliance
Safe by default
Compliance is design material — a first-class Restriction Engine consumed by Compose and Views. Programs tighten policy without forking components.
Vehicle state
Driving · 48 km/h
Policy
Limit string · No keyboard
Outcome
Browse substituted
Illustrative restriction path — widgets query policy; they do not hardcode OEM if/else trees.
UX restrictions
Touch targets, density, contrast, and day/night profiles that both UI stacks honor from the same policy.
Glanceability
Typography and layout budgets so primary values arrive in under a second without scanning the whole screen.
Safety-critical
Deterministic affordances and fail-safe presentation when vehicle signals are missing — never invented values.