What caused the Legacy Way Tunnel closure and traffic chaos

“Early this morning an incident occurred in one of the Legacy Way substations, which has impacted the power supply to the tunnel,” Transurban said in a statement.
Kwitowski said traffic congestion started easing about 9.30am.
“But that’s because commuting has died down a bit,” she said, adding that motorists on the Western Freeway from Kenmore through to Toowong had experienced lengthy delays.
Commuters travelling on the Inner City Bypass from Bowen Hills to the CBD and on Milton Road also faced congestion.
On average, Legacy Way carries 24,000 vehicles every day, generating more than $40 million in annual revenue for Transurban, which allocates around $3 million of that for maintenance.