Emergency roadwork on the Richmond-San Rafael Bridge prompted a severe traffic alert Monday for both westbound and eastbound directions, which was expected to impact the afternoon commute, authorities said.

Caltrans said maintenance crews on discovered “unsound, spalling concrete” of the eastbound upper deck of the span.

Crumbling pieces of concrete on the upper deck of the Richmond-San Rafael Bridge forced emergency repairs and lane closures in both directions Monday. Lauren Toms reports.