No progress has been made in reducing a massive backlog of overdue road maintenance in Western Australia, with Main Roads only reacting when the need becomes critical, the auditor-general says.

According to a report released by Colin Murphy, the maintenance backlog was $820 million in 2009 and has crept up to $845 million. Mr Murphy said the figure was likely to stay high given minimal effort with preventative maintenance. “Although Main Roads has done some preventative resurfacing on parts of…