2003 Subaru Impreza Owner's Manual - Page 257

Starting and operating as they may burn easily if they come near hot engine or exhaust system parts. D Be sure to stop the engine if you take a nap in the vehicle. If engine exhaust gas enters the passenger compartment, occupants in the vehicle could die from carbon monoxide (CO) contained in the exhaust gas. Cruise control (if equipped) Cruise control enables you to maintain a constant vehicle speed without holding your foot on the accelerator pedal and it is operative when the vehicle speed is 25 mph (40 km/h) or more. Make sure the main switch is turned "OFF" when the cruise control is not in use to avoid unintentionally by setting the cruise control. CAUTION If your vehicle has a front underspoiler and rear underspoiler (both optional), pay attention to blocks and other obstructions on the ground when parking. The underspoilers could be damaged by contact with them. WARNING Do not use the cruise control under any of the following conditions. This may cause loss of vehicle control: D driving up or down a steep grade D driving on slippery or winding roads D driving in heavy traffic 7-28