The Sun (U.K.) reports:

Motorists were driven mad when they got stuck in a two-mile rush-hour jam -- caused by council officials doing a traffic survey....

Poole[, Dorset] Borough Council transport boss Steve Tite said: "We were aiming to understand drivers' problems and reduce traffic congestion.

"It was not possible to give advanced warning as drivers might have taken alternative routes."Thanks to Reason's Brickbats column for the pointer.