An alert system for a vehicle includes a lane departure warning system for detecting lane markers on a road being traveled by the equipped vehicle and a side object detection system for detecting the presence of another vehicle in a side lane adjacent to the lane being traveled by the equipped vehicle. When the lane departure warning system detects the equipped vehicle making a lane change into a side lane and when the side object detection system detects a vehicle in that side lane, the alert system may generate an alert to the driver of the equipped vehicle. The alert system may detect a stoplight or stop sign in the forward field of view of a forward facing camera and may generate an alert if the system determines that the equipped vehicle is not going to stop at the stoplight or stop sign.