ALMS introduced the use of a position light system, 3 little lights that would indicate the position in class of each car in the top 3. They can be seen in front of the rear tire below.

(Photo from ALMS.com)

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Well the newly merged USCR has taken it to the next level. How about an iPad sized full position indicator?

(Photo from Marshall Pruett at Racer.com)

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The boards will be mandatory on all cars.