Learner drivers have to wait up to five months to take car and vocational driving tests in the Western Isles.
In the past, tests were available within four weeks.
Delays have apparently crept in following the merging of the Driving Standards Agency (DSA) and the Vehicle and Operator Services Agency (VOSA).
The new Driver and Vehicle Standards Agency (DVSA) said it would offer incentives for examiners to travel to the islands to help clear the backlog.
MP Angus MacNeil said the situation is "unacceptable."
Mr MacNeil said: “Delays to vocational testing such as those for HGV, bus, trailer tests etc has an effect on people’s livelihoods and the DVSA needs to address this situation as a matter of urgency.
“The test delays are also affecting those wishing to secure a car driver’s licence which is especially disappointing for young people hoping to pass their test before heading for university."
He urged the UK government agency to give priority to rural and island locations.
Five month wait for driving tests
6 July 2016