Yeah .... those "rest areas" can be pretty dangerous.
Several years back, an 'older' friend of mine; a gun shop owner, and WWII vet .... told me of an incident that took place one time, while he and his wife were on a road trip to visit their daughter. While making a 'pit-stop' at a rest area .... he was standing (alone) at the john, when a guy armed with (luckily) only a knife, came in behind him - apparently thinking Jim looked like an "easy target" - and demanded his wallet. Jim always 'carried', but with his .45 out in the car .... what he pulled out of his back pocket was one of those .22's that are carried in a 'wallet' type holster, with a hole for trigger access .... and can be fired from its "holster". He turned around and put one round, just past the guy's head - to let him know it was 'real' .... then stuck it in his face, and told him to 'run like hell' .... he did.