![LOW BRIDGE AHEAD Traffic Sign](https://inps.net/traffic/sites/default/files/stock-products/TC-33_-Low-Bridge-Ahead-XXM_INPS-190-51.jpg)
The TC-33 sign is used to warn of a low bridge ahead to provide trucks with the opportunity to exit the highway. The TC-33 sign must be installed approximately 400 m in advance of the last exit that trucks can use to avoid low clearance in a construction area.