This dashcam footage from the United States shows a dozy Toyota RAV4 driver react exceedingly late to traffic on a highway, causing a nasty smash with a Subaru WRX.

The clip was filmed from inside the Subaru (on October 2018, despite the video's 2017 date stamp), which is shown moving over into the outside lane (remember, this is the US) of a highway in Pennsylvania.

At around the 20-second mark, you’ll be able to spot traffic building up in the middle lane.

The RAV4 driver, however, is clearly distracted and reacts far too late, clattering into a stationary sedan (which, in turn, hits the vehicle in front of it) and swerving into the left lane … right into the path of the camera-equipped WRX.

Watch the footage above…