Driving 64 Share definition Flag Playing it safe. The interstate speed limit is 65. So,one driving 64 is playing it safe. I asked Mike is he wanted to spend his bonus on a vacation, but he wants to put it in the bank. He's driving 64. Driving 64 by IllinoisPam April 4, 2009 0 0 Get merch Get the Driving 64 mug. Buy Now — $32.95 See more merch