Why were they speeding? Do the math!
In "real life" there was no reason for Bandit and Snowman (Jerry Reed) to be speeding like they did.
900 miles in 28 hours? Do the math, 900/28= 32 miles per hour. If the boys did the speed limit and did the whole trip going 60 MPH (which is more normal but still right lane traffic), and they took 4 hours of that in segments to eat, pee, and stretch legs, they would have travelled 1,440 miles (24 X 60= 1,440). Going 55 MPH, they could have made the journey in total in about 16 hours, with 12 hours to spare to rest, sleep, eat and bang Sally Field, so.....
I know this because I know math, and I have done roughly this distance, from Las Vegas, Nevada to Memphis Tennessee which was 1600 miles and made it in about that much time.
Maybe Bandit and Snowman didn't understand math well being country boys. So why speed?