Since the amount of damage inflicted upon others is proportional to the momentum, let's set a small--but non-zero--maximum limit to the minimum momentum of travelers approaching intersections.
1 mph = 0.45 meters/second
For example, let's use some typical masses:
- Pedestrian = 70 kg
- Bicycle+rider = 100 kg
- Automobile+driver = 2000 kg
- a pedestrian needs to slow down to 1.4 m/s or about 3 mph when approaching a stop sign.
- a bicylist needs to slows down to 1 m/s or about 2 mph.
- an automobile needs to slow down to 0.05 m/s or about 0.1 mph.
If others are near the intersection, then the normal rules of total stop (zero momentum) and right of way assignment apply.