I like the ability to quickly see freeway information signs. Here’s the news release from Caltrans:

SACRAMENTO – Caltrans today announced it has launched Caltrans QuickMap, an
online service that provides California motorists with real-time traffic
and travel information that will allow them to make better decisions about
how to reach their destination more rapidly.

To access Caltrans QuickMap, visit the Caltrans site at quickmap.dot.ca.gov
.

“A wide range of useful information is now easily accessible to help
motorists avoid congestion and reduce their travel times,” said Caltrans
Director Malcolm Dougherty. “This exciting innovation delivers real-time
data so travelers can adjust their routes to get where they’re going as
quickly as possible.”

Visitors to the online interactive travel map can access nearly 1,000
freeway cameras and more than 700 electronic message signs on highways
statewide. They can also monitor traffic congestion, California Highway
Patrol incidents, travel time information, lane closures due to highway
roadwork, and Amber Alerts. Other helpful features of the service include
chain control information and color-coded traffic speed displays for
freeways statewide.