An apparatus comprising a flag generation circuit configured to generate a full flag signal in response to a read clock signal, a write clock signal and a look ahead bitwise comparison configured to detect when a read count signal and a write count signal are equal. In order to activate the inductance loop vehicle detector, the vehicle, attached magnet, and casing are moved in relation to an induction loop embedded within a roadway. Each module includes: a circuit protection device; and a power output connection location. The actual oxidant amount is compared to a target amount of oxidants to be stored in the catalytic converter.