An improperly placarded vehicle can only be moved:

Question

A vehicle must be properly placarded before it can be driven. A vehicle that does not display the proper placards may not be moved unless doing so is necessary to protect life or property in an emergency.

Accepted Answer

During an emergency.

Answer

To make room for other vehicles.

Answer

If the vehicle will be traveling a distance shorter than 10 miles.

Answer

To wash the vehicle.