NFS Heat was about to have drag race option since it was shoed in the reveal trailer. In the trailer it is shown how to cars prepare for drag and start when street lights fall to green light. I have attached two picture so you can see how it is. And also we have drag tires in the game. This is another sign that there was going to be drag race option. Sadly it is removed and probably unfinished.
See Also
NFS: Heat Studio