Transport Canberra has launched an investigation after dashcam footage emerged showing a car's near-miss with a light rail vehicle.

The video, posted to the Canberra Drivers Facebook page on Sunday, shows a tram running through a T-intersection at Randwick Street in Mitchell when the driver at the cross street had a green light.

It is unclear whether the tram ran a red light or the signal malfunctioned. Transport Canberra said it was investigating the incident.

Separately, another woman has told The Canberra Times she had a similar experience while turning right from Mouat Street in Lyneham on to Northbourne Avenue last Monday around 8am.