Roadworks are causing delays in the Watford ring road this afternoon.
Ringway are carrying out slot cutting for cabling works on the A411 Exchange Road at the junction with Kings Road.
Major tailbacks have built up around town as traffic is being diverted around the two-lane closure.
Motorists vented their anger at the chaos on social media.
Natti Martin tweeted: "The closure of two lanes has caused a traffic jam."