Always have paper copies unless you can memorize all the states that allow electronic. A DOT or scale master will almost always prefer to see a paper copy and it's very simple to just have it in your permit book when you go inside. What if you happen to be in an area where your cell service isn't the best and they can't read the electronic and want you to email it to them? Now you're in a pickle but wouldn't be with paper. Not to mention, if you have to have your dispatch email it, that's even more time sitting there, giving them the opportunity to decide to go a different route.
A department of the federal executive branch responsible for the national highways and for railroad and airline safety. It also manages Amtrak, the national railroad system, and the Coast Guard.
State and Federal DOT Officers are responsible for commercial vehicle enforcement. "The truck police" you could call them.
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We are looking at using smart phones or tablets for displaying permits instead of carrying paper copies. Does anyone have any suggestions for a phone that would have at least a 3.5X5 inch display that is reasonably priced. Much thanks!