IS 1a IS 1b IS 1c
Meaning under the Decree
The signs give the direction to the destination or destinations shown, using the motorway. The motorway symbol may also be used on the sign on its own.
294/2015 příloha 5
IS 1d IS 1e IS 1f Direction sign before a motorway slip road (ahead, left or right) 
IS 2a IS 2b IS 2c Direction sign to a road for motor vehicles (ahead, left or right) 
IS 2d IS 2e IS 2f Direction sign before a slip road onto a road for motor vehicles (ahead, left or right) 
IS 3a IS 3b IS 3c Direction sign with a destination (ahead, left or right) 
IS 4a IS 4b IS 4c Direction sign with a local destination (ahead, left or right) 
IS 5 Direction sign with another destination