Final answer:
In general, parked vehicles should be visible for at least 200 feet to ensure on-road safety. This allows oncoming drivers enough time to see and react to the parked car to avoid collisions. Stopping distances can vary, so it's vital for visibility and road safety to be maintained.
Step-by-step explanation:
When you park on a roadway, visibility requirements depend on the local traffic laws, but a common rule for safety is that your vehicle should be visible for at least 200 feet to other road users. This allows for sufficient reaction time for oncoming drivers to notice a parked car and safely navigate around it. In terms of the parking visibility for on-road safety, this distance gives oncoming drivers enough time to adjust their speed or change lanes if necessary to avoid a collision.
Considering the information on safe crossing distances and road speeds, one must always ensure enough distance for drivers to perceive pedestrians or other obstacles and come to a complete stop if necessary. The stopping distance of a vehicle can vary greatly depending on road conditions and the driver's reaction time, therefore it's crucial for both drivers and pedestrians to be mindful of these factors for road safety.