The bridge, which links Paisley to Dumbarton and the Vale, has no safety signs or warning lights displayed on the local side of the road to make drivers aware of the outage.

Scotland TranServ, who are in charge of the bridge lighting, say they took action to fix a number of lights – however on further inspection some were still out.

Commuter Stuart Wood 43, from Old Kilpatrick, reported the fault several weeks ago.

He told the Reporter: “I noticed about a month ago that halfway across the bridge, to the A82 on the Balloch side is in complete darkness. My partner got in contact with the roads agency, and they told her it was TranServ who were in charge.

“That was well over a month ago, there’s no road marking, no cats eyes, and it’s pitch darkness.” Around 40,000 drivers are thought to cross the bridge each day – and the current lack of lighting has sparked safety concerns.

Mr Wood added: “There are enough accidents, it’s a bad corner, a tight corner if someone doesn’t know the bridge, and there could easily be an accident. Why is it just Dumbarton side that’s in the dark? Why is there no signage to warn people?

“There’s been no communication from anyone, we’ve not heard anything back. It’s a poor show – they spent millions on the bridge recently, and now half of it is in darkness for no reason.

“It’s a safety issue more than anything else, we regularly go over the bridge, now it’s better in the good weather but you cant rely on that.

“There is complete lack of communication and lack of warning that something is amiss.” A spokesman for Scotland Transerv told the Reporter that all the lights had been fixed, however on further investigation, it turned out a number of the lights were still out.

When the Reporter reported the faults, the spokesman added: “Scotland TranServ were notified early March that there was an issue with the bridge lighting and high mast lighting at the north end of the Erskine Bridge and have taken every step possible to ensure the issue could be rectified as quickly as possible.

“Scotland TranServ has had to carry out extensive cable investigation work and liaise with Scottish Power over the past few weeks in order to find out what was causing the fault.

“The fault has now been rectified with almost all of the lights being illuminated overnight with the remainder to be fully operational by the weekend.”