You can always drop the friend off close to his or her house. Always look inside the car before you get in. Be sure to look in the back seat. Attackers do hide in back seats. Know what to do if your car breaks down.
Flares are especially useful.
Practice with one during the day so you will know how to use it at night. Don't try to change a tire at night. Open your hood and light a flare, if you have one. Turn on your emergency blinkers. Keep the car doors locked and windows rolled up.