Here is the simplest solution. On the northern most part of the map there is a hidden car called the Delahaye 135MS Cabriolet.
Simply pull out of the driveway, turn right on Franklin Ave, and take off straight. The road is straight and downhill. Avoid traffic and in 10 seconds you'll have your achievement.
[img][/img]lanoireLEADFOOT by
ThaAnswerMD25, on Flickr