[silverdrake11]

It seems like a logistical problem and lack of public restrooms. There is no easy solution. Let's say you are driving in an urban area, where can you go? Maybe there's traffic too. Where are you going to park? Or you are in a rural area and the next gas station is miles away. Your options are clearly limited.

[ilovetux]

There are a number of commercial solutions available which Amazon could provide for their drivers. With a little planning and training it could be kept sanitary.