The earthquake changed the Bay Area's automobile transportation landscape. Not only did the quake force seismic retrofitting of all Bay Area bridges,Caltrans. Richmond – San Rafael Bridge. "Retrofit Project". Retrieved September 20, 2009.Caltrans. Bay Area Toll Bridges. "Benicia–Martinez Bridge Seismic Retrofit". Retrieved September 20, 2009.Caltrans. Bay Area Toll Bridges. "Carquinez Bridge Seismic Retrofit". Retrieved September 20, 2009.Caltrans. Bay Area Toll Bridges. "San Francisco – Oakland Bay Bridge Retrofit". Retrieved September 20, 2009.Caltrans. Bay Area Toll Bridges. "San Mateo – Hayward seismic retrofit". Retrieved September 20, 2009.Caltrans. Toll Bridge Program Oversight Committee. "Toll Bridge Seismic Retrofit Report, September 30, 2008". Retrieved September 20, 2009.</ref> it caused enough damage that some parts of the region's freeway system had to be demolished. Damage to the region's transportation system was estimated at $1.8 billion (equivalent to $ billion today).