The Ford Explorer is a mid-size sport utility vehicle produced by the American manufacturer Ford since 1988, but in 2012 it was redesigned as a Crossover (CUV). The Ford Explorer has become one of the most popular sport utility vehicles on the road. Part-time four-wheel drive is an available option, and since 1995 this has been a 'shift on the fly' system with full protection against being engaged at high speed. Remote keyless entry systems are an available option for all Ford Explorer models and are a standard feature on all newer models.