When you are driving on a freeway posted for 65 mph and most of the other vehicles are driving 70 mph or faster you may legally drive?

65. If the legally posted limit is 65 the limit is 65. Just because other drivers are going 70 only means they are breaking the law. There is no law that says you can go 10 mph above the posted limit before a ticket can be issued. You can get a ticket for going 1 mph faster than the posted limit. Most policy will not issue a citation for a small amount but legally they can.