The system was similar to the Electro-PACER lights used in the Indianapolis 500 races from 1972 until 1978, except that engine control units (ECU) were involved and could enforce speed limits under the current system.
O sistema era similar ás luces de Electro-PACER usadas nas carreiras das 500 Millas de Indianápolis de 1972 ata 1978, agás que as unidades de control de motores (ECU) están implicadas e poden facer cumprir os límites de velocidade no sistema actual.