1. A forward-facing vision system for a vehicle, said forward-facing vision system comprising: a forward-facing camera comprising an imaging sensor and a lens; said imaging sensor comprising a plurality of photo-sensing pixels arranged in a matrix of multiple horizontal rows of photo-sensing pixels and multiple vertical columns of photo-sensing pixels; wherein said forward-facing camera is disposed in a windshield electronics module attached at a windshield of a vehicle equipped with said forward-facing vision system, said forward-facing camera, when disposed in said windshield electronics module attached at the windshield, viewing through the windshield exteriorly of the equipped vehicle; wherein said imaging sensor is operable to capture image data representative of a scene exterior of the equipped vehicle and in the field of view of said forward-facing camera; a control comprising a processor; wherein said processor, responsive to processing of captured image data, detects taillights of leading vehicles within the exterior field of view of said forward-facing camera when the equipped vehicle is operated under nighttime conditions; wherein said processor, responsive to processing of captured image data, detects lane markers within the exterior field of view of said forward-facing camera on a road being traveled by the equipped vehicle; wherein said control, responsive to said lane markers detection and to a determination based at least in part on processing of captured image data by said processor that the equipped vehicle is drifting out of a traffic lane that the equipped vehicle is currently travelling in and when a turn signal of the equipped vehicle is not being activated, controls a steering system of the equipped vehicle to adjust the steering direction of the equipped vehicle to mitigate such drift out of the traffic lane the equipped vehicle is travelling in, and wherein said steering system is manually controllable by a driver of the equipped vehicle irrespective of control by said control; wherein said processor processes captured image data via an edge detection algorithm to detect edges of vehicles present exteriorly of the equipped vehicle and within the exterior field of view of said forward-facing camera; wherein said processor processes captured image data to estimate distance from the equipped vehicle to a detected vehicle that is present exteriorly of the equipped vehicle and within the exterior field of view of said forward-facing camera; wherein said processor, based at least in part on detection of lane markers via processing of captured image data, determines curvature of the road being traveled by the equipped vehicle; and wherein said processor processes captured image data for at least one driver assistance system of the equipped vehicle selected from the group consisting of (i) a traffic sign recognition system of the equipped vehicle, (ii) a stop light recognition system of the equipped vehicle, (iii) a stop sign recognition system of the equipped vehicle and (iv) a vehicle speed control system of the equipped vehicle.