It is the maximum? The recommendation? The minimum? I stay 5-10 over if possible. But lately its been impossible as many people drive well under the speed limit. I have some words for whoever taught drivers ed in Indianapolis 40-50 years ago. Im not sure if people are religious about not exceeding the limit, or if they simply have nothing to live for and love coasting minimal speed to their destination. Driving 10-15 mph under the limit is dangerous and causes unbelievable traffic.