The video was clear and to make sure competitors understood, NASCAR repeated the rule in the drivers meeting before Sunday's race at Richmond International Raceway.
Drivers needed to have all four tires under the orange box at the commitment line to enter pit road.
Six drivers - including Kyle Busch and Martin Truex Jr. - were penalized for a commitment line violation Sunday. Also penalized for the infraction were Aric Almirola, Clint Bowyer, Danica Patrick and Reed Sorenson. This came a day after four Xfintiy drivers were penalized for a commitment line violation in that race.
In the rules video, which was played before Sunday's Cup race, it stated: "The yellow commitment line is identified by an orange painted box. You are committed to pit road if you put four tires below the orange box.
After the video, Richard Buck, Cup series director, went over a few points with drivers, including the commitment line. Buck told competitors: "Once again, at pit entrance it's all four tires under the orange commitment box.''
-- NBC Sports --
UPDATE: NASCAR changed the commitment line rule at Richmond International Raceway but a series official said the sanctioning body made the new rule "abundantly clear" to competitors.
Scott Miller, NASCAR senior vice president of competition, explained the reason for the change on "The Morning Drive" on SiriusXM NASCAR Radio.
"The reason that we changed it is we needed to really make it universal across the series so that everybody communicating about the commitment line had a common message across all of the race tracks,'' Miller said.
"Some places it was two tires, some places there was an orange cone, some places it was this, some places it was that. To us, actually, for you guys to report on or for television to show a different commitment line rule like every week got to be a little bit of a challenge, so we huddled up and came up with the universal rule for all tracks and clearly communicated it to the industry.''
The rule is listed in Section 10.9.3.e in the Cup Rule Book. It was stated in the video and Richard Buck, Cup series director, reiterated the rule change after the video during the drivers meeting before Sunday's race.
-- NBC Sports --