I also try to do a minimum of the double nickel 55 If you are traveling much less than that, then you are a hinderence on the road. Maybe you should look at not traveling on major highways. You could cause an accident. Always put your emergency flashers on when on uphill grades. I'm sorry to be so critical, but I almost slammed into a fifth wheel last summer, that was doing less than 50. When I had to slam on the brakes, everything went flying in the trailer. What a mess. It could have been worse, but I almost s_ _t my pants. I got the trailer slowed down, but a tractor trailer might not be that lucky.