Method and apparatus for measuring a height of a vehicle

An apparatus for measuring a height of a vehicle on a road, comprising:

• a vehicle classification sensor directed from a point above the road onto a section of the road and configured to record, in a given coordinate system, a 3D representation of the vehicle passing the section;
• a camera with a known angle of aperture directed from an elevated point at a side of the road onto the section and configured to record a 2D image of at least an upper portion of the vehicle and a background above the upper portion of the vehicle;
• and
• a processor connected to the vehicle classification sensor and the camera and configured to
• determine an edge profile between the upper portion of the vehicle and the background in the 2D image,
• establish, in the coordinate system, a fan of rays each extending from the elevated point and through a different one of multiple points along the edge profile,
• shift the 3D representation in the coordinate system in height until it is tangent to said fan, and
• determine said height of the vehicle from the shifted 3D representation in the coordinate system.