What is an optional document to take with you while driving?

Answer: A — paper map

A paper map is the most useful option to bring with you while driving because it can help you navigate in case your phone or GPS fails. A divided highway sign is not a document but a physical sign on the road, so it is not an option to bring with you while driving. A driver's license is a mandatory document to have while driving and is required by law, but it is not optional. Proof of insurance is also a mandatory document to have while driving and is required by law, but it is not optional.