In an aspect, there is provided a correlator for guiding a vehicle onto a vehicle conveyor. The correlator includes a wheel support surface defining a receiving end of the correlator and a conveyor-interfacing end of the correlator. The wheel support surface is positioned to support a wheel of the vehicle as the wheel rolls thereon. The correlator further includes at least one guide structure positioned to guide a wheel of the vehicle laterally during travel of the wheel on the wheel support surface from the receiving end towards the conveyor-interfacing end. The wheel support surface has a surface region having surface properties selected such that a coefficient of friction between the surface region and tire rubber is sufficiently low to prevent the wheel from having sufficient traction on the surface region to enable climbing of the wheel onto the at least one guide structure.