Abstract: A vision system of a vehicle includes a camera disposed at a vehicle and having a field of view forward of the vehicle. The camera includes a two dimensional imaging array of a plurality of photosensing pixels and is operable to capture image data. A control includes an image processor that is operable to process image data captured by the camera. The image processor, responsive at least in part to processing of captured image data, is operable to determine road signs ahead of the vehicle, and the image processor uses a matrix algorithm for determining road signs along the road and for determining road sign information for displaying to the driver of the vehicle. The road signs may include speed limit signs and the control may, responsive at least in part to a determination of weather conditions, determine the appropriate speed limit to display to the driver.