1. A system configured to determine a vehicle position in a multilane open road environment, the system comprising: a plurality of induction loop sensors positioned to detect vehicles within a pair of adjacent lanes; an RF system configured to communicate with RF transponders carried by vehicles within the pair of adjacent lanes; one or more processors configured (i) to determine first vehicle position information related to the position of a vehicle in the pair of adjacent lanes based on output of the induction loop sensors, (ii) to determine second vehicle position information related to the position of the vehicle in the pair of adjacent lanes based on output of the RF system, (iii) to make a final determination of the position of the vehicle in the pair of adjacent lanes based on the first vehicle position information and the second vehicle position information.