Police have reopened the A41 after it was shut for nearly three hours.
Emergency services were called to a collision between two cars and a lorry at 1.20pm northbound near the Two Waters Road junction between Kings Langley and Hemel Hempstead.
The road was shut to recover vehicles, and the police have reported "slight injuries".
There were reports of four fire engines, ambulances, and numerous police attending.
Drivers were stuck on the A41 approaching the closure.
There was gridlock on surrounding routes due to the closure, especially through Kings Langley towards Hemel Hempstead.
A broken down vehicle at the M25/A41 roundabout caused further mayhem during the afternoon.
The A41 was reopened at around 4.15pm and the stranded vehicle on the roundabout was recovered.
But there was to be further woe as a second vehicle broke down, this time on the A41 southbound approaching the M25 roundabout.
It led to delays of around 80 minutes for drivers travelling down from Hemel while roads through Kings Langley and Nash Mills remained gridlocked for much of the rush hour.
near Apsley Retail Park earlier in the afternoon
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