A method includes identifying, by an electronic tolling system, a node. The node is associated with a vehicle. The node is configured to identify the vehicle to the electronic tolling system. The method identifies, by the electronic tolling system, a vehicle height calculation system. The method receives, by the electronic tolling system, a height for the vehicle from the vehicle height calculation system. The method receives by the electronic tolling system, a height limit. The height limit is associated with one or more roadways for which the electronic tolling system is configured to collect tolls. The method compares, by the electronic tolling system, the vehicle height to the height limit. The method is responsive to the vehicle height is greater than the height limit, by generating, by the electronic tolling system, an alert. The method sends the alert from the electronic tolling system to an alert display.