What is the required placement for warning devices on divided highways when lights are not required?

The correct answer outlines the proper placement of warning devices, which are essential for alerting other drivers to a stationary vehicle in potentially hazardous situations. According to Illinois regulations, when lights are not required, the placement of these warning devices must be strategic to effectively warn approaching traffic.

In this case, placing one warning device at 200 feet and a second at 100 feet to the rear of the vehicle provides ample warning distance for oncoming drivers. This setup allows for adequate visibility of the warning devices from a considerable distance while ensuring that drivers have enough time to react and navigate safely around the vehicle.

The distances mentioned in the correct answer offer a balance that adheres to safety standards, ensuring that vehicles approaching from behind and from in front can see the devices in time to take appropriate action.