Shippers and receivers often don't allow truck drivers to use their warehouse bathrooms. The lack of facilities is particularly tough for female drivers,
https://www.msn.com/en-ca/money/markets/truckers-say-they-re-denied-bathrooms-on-the-job-forcing-female-drivers-to-take-creative-measures-to-relieve-themselves/ar-AATzlhp?ocid=msedgntp