Motorists were sent into a panic by a car driving the wrong way along the A41 this afternoon.
The silver Fiat struck fear into road users on both sides of the dual carriageway, who witnessed it heading south on the northbound lanes from Tring shortly after 3pm.
Police closed the road at Kings Langley and the car was stopped there by 3.20pm.
The vehicle, which was being driven by a man in his 60s, was moved to the side of the road and later recovered.
The road was reopened shortly afterwards.
Police spokesman Giles Cooper said: “Thankfully, there were no collisions or injuries. Police now need to establish the exact circumstances behind the incident.”
A video of the mishap was posted on Facebook page Everything Tring, where users of the site expressed relief that no serious accidents took place.