Bridge monitoring and safety weigh-in-motion systems for bridge protection and bridge traffic data collection, namely, electrical controllers, software for measuring weight and axle spacings, electric sensors, electric message signs, and imaging devices consisting of cameras; Weigh-in-motion systems for bridge protection, consisting of weigh-in-motion scales, weighing machines consisting of weight pads, portable weigh-in-motion scales, weighing machines consisting of portable weight pads, electrical controllers, imaging devices consisting of cameras, and electric message signs, all the foregoing for bridge loading detection, bridge over-load detection, vehicle weight detection, vehicle over-weight detection, vehicle over-dimension and over-height detection; Weigh-in-motion systems for bridge traffic data, namely, traffic data collection devices at bridge sites comprised of electric sensors, electrical controllers, traffic counting sensors, and traffic classifying sensors, all the foregoing for monitoring approaching traffic, for tracking, counting, classifying, and measuring vehicle traffic, and for assessing operation life of bridges, assessing bridge loading, monitoring vehicle traffic, monitoring vehicle class and weight, calculating road damage, and calculating equivalent single axle loading; Bridge monitoring and safety systems, comprised of computer software for tracking, counting, classifying, and measuring vehicle traffic approaching bridge sites via traffic data collection devices, namely, sensors, traffic counters, and traffic classifiers and weigh-in-motion scales, weight pads, portable weigh-in-motion scales, and portable weight pads