2012 GMC Acadia Owner's Manual - Page 261

Driving and Operating Other driving tips include: . . 9-7 Keep the vehicle well ventilated. Keep the interior temperature cool. Keep your eyes moving - scan the road ahead and to the sides. Check the rearview mirror and vehicle instruments often. { WARNING If you do not shift down, the brakes could get so hot that they would not work well. You would then have poor braking or even none going down a hill. You could crash. Shift down to let the engine assist the brakes on a steep downhill slope. . Stay in your own lane. Do not swing wide or cut across the center of the road. Drive at speeds that let you stay in your own lane. Be alert on top of hills, something could be in your lane (stalled car, accident). Pay attention to special road signs (falling rocks area, winding roads, long grades, passing or no-passing zones) and take appropriate action. . . . . Hill and Mountain Roads Driving on steep hills or through mountains is different than driving on flat or rolling terrain. Tips for driving in these conditions include: . { WARNING Coasting downhill in N (Neutral) or with the ignition off is dangerous. The brakes will have to do all the work of slowing down and they could get so hot that they would not work well. You would then have poor braking or even none going down a hill. You could crash. Always have the engine running and the vehicle in gear when going downhill. Winter Driving Driving on Snow or Ice Drive carefully when there is snow or ice between the tires and the road, creating less traction or grip. Wet ice can occur at about 0°C (32°F) when freezing rain begins to fall, resulting in even less traction. Avoid driving on wet ice or in freezing rain until roads can be treated with salt or sand. Keep the vehicle serviced and in good shape. Check all fluid levels and brakes, tires, cooling system, and transmission. Shift to a lower gear when going down steep or long hills. . .