A vehicular forward viewing image capture system includes an accessory module configured for attachment at an in-cabin side of a windshield of a vehicle. While the vehicle is traveling along a road, multiple frames of captured image data are processed at a data processor to determine movement of an object of interest present in a field of view of the CMOS image sensor. The vehicular forward viewing image capture system is provided with vehicle data via a vehicle communication bus. With the accessory module attached at the in-cabin side of the windshield of the vehicle, image data captured by the CMOS image sensor and vehicle data provided via the vehicle communication bus are processed. With the accessory module attached at the in-cabin side of the windshield of the vehicle, captured image data is processed to determine a road condition of the road ahead of the equipped vehicle.