1998 Cadillac Seville Owner's Manual - Page 220

Then here are some tips: Make sure your vehicle is well ventilated, with a comfortably cool interior. Keep your eyes moving. Scan the road ahead and to the sides. Check your rearview mirrors and your instruments frequently. If you get sleepy, pull offthe road into a rest, service or parking area and take a nap, get some exercise, or both. For safety, treat drowsiness on highway as the an emergency. Hill and Mountain Roads Driving on steep hills or mountainsdifferent from is driving in flat or rolling terrain.