Most motorists are familiar with the Expressway Monitoring and Advisory System, or EMAS, that uses strategically located cameras to detect unusual traffic conditions on the expressways.

Motorists are then given advance warning of adverse traffic conditions in the following ways:

Before entering the expressways: by electronic signboards near the entrances to the expressway
Along the expressway: by two types of electronic signboards along the expressway
By radio announcements and TV broadcasts

Just how familiar are you with the symbols on the EMAS signboard? Here is a list of EMAS symbols and their meanings.