News / Traffic
The outage, at around 6am, knocked out the lights across the north of Glasgow.
The motorway is closed at junction 22 with the M77 slip road also shut.
Transport Scotland data showed an average of 1.2 trips per person per day for the week ending Sunday.
The smash happened on the approach to the Kingston Bridge at around 10.40am.
A stretch of the A1 in East Lothian was closed to all vehicles from 5am on Tuesday.