Mid Nite Blu
I posted this on the other thread, but condensed it here for you since you are driving to SLC
In St. George, you are still in desert but it tends to start elevating once out of St. George. Uphill to Cedar City. No restautants or petrol from St. George to Cedar City. Cedar City is full of gas stations and fast food places. Once out of Cedar City, you enter the Great Basin. This is an incredible area that by definition means that any rainfall or snow that enters the great basin can only leave by evaporation as there are no rivers taking water out of the basin to the ocean. This Great Basin Park covers western Utah and a large portion of Nevada. Once you get north of Cedar City, the landscape changes to grasslands, and long stretches of nothingness, except small towns with many churches with white spiral towers, very unique, be sure to take the time to notice this. Towns are interspersed with petrol stations. You also enter Capitol Reef National Park. However, this is a famous place for Utah Highway Patrol (who usually don't have a sense of humor), they have white/silver stripped Shelby Mustangs and are all over the place. In central Utah there are a lot of highway over passes going across I-15, which is a favorite place for these guys to set up their speed traps. Radar detectors are a must. The main problem that arises coming from the south into the Salt Lake Valley is this. Once you are on I-15 40-50 miles south of Provo, the traffic in the afternoons rivals any traffic in Los Angeles. 4-5 lanes of stop and go and this lasts for 60-70 miles. Entering the Provo area in the afternoon, after 3 PM is a major traffic headache. Any efforts made to get you into the SLC Valley before that time would be beneficial to your driving experience. The traffic is so horrendous, and the fact that so many people have moved into this area without freeway planning to solve this bottleneck, make for a long day. Once into the SLC Valley, stay on I-15 into SLC, take the 6th South Exit, drive 4 blocks to Main Street and you are at the hotel.
The big issue is being south of Provo after 3 PM heading north. Stop and go, and frequently it is stopped.