Trucker Bathroom Access Act This bill expands access to restroom facilities for certain commercial truck drivers, including drayage truck operators. Drayage truck operator means the driver of any in-use on-road vehicle with a gross vehicle weight rating of greater than 33,000 pounds operating on or transgressing through port or intermodal rail yard property for the purpose of loading, unloading, or transporting cargo, including containerized, bulk, or break-bulk goods. Specifically, the bill requires certain retailers, warehouses, and other establishments to give commercial truck drivers access to existing restroom facilities when they are loading or delivering cargo, or waiting to load or transport cargo. Further, operators of ports and marine terminals must provide drayage truck operators with (1) access to existing restrooms, (2) additional restrooms if necessary, and (3) parking while accessing such restrooms.