If U missed it: What the 2012 #NASCAR NATIONWIDE RULE BOOK SAYS ABOUT STARTS/RESTARTS:
Section 10-2: GREEN FLAG:
A. The green flag signifies the start or restart of racing conditions. At the beginning of the Race/restarts, when the green flag is displayed by the starter, cars must maintain position as designated by NASCAR Officials until they have crossed the start/finish line, and the No. 2 position must not beat the No. 1 position to the start/finish line.
B. All restarts shall be made at a designated zone on the race track and will be made known to the drivers in the Pre-Race driver's meeting.