Who do you think will be your best friend at zombie apocalypse? This should be someone, or something that could protect you from the zombies. There is nothing better that a huge roader on the highway so hop in and drive over those zombies.
The zombie apocalypse is a terrible time to live, but you should hold on and help other people who try to save their lives. Highways are considered as the worst places to be spotted by zombies, as there are no places you could hide. However, you have your huge roader and no zombies will survive after this terrible hit. Change the lane when you see a living person, but kill as many zombies as you can.