All road signs
IS1aDirection sign for approach to a motorway (straight ahead, left or right)
IS1bDirection sign for approach to a motorway (straight ahead, left or right)
IS1dDirection sign before a motorway slip road (straight ahead, left or right)
IS1eDirection sign before a motorway slip road (straight ahead, left or right)
IS1fDirection sign before a motorway slip road (straight ahead, left or right)

IS1cInformative sign
IS1c Direction sign for approach to a motorway (straight ahead, left or right)
Direction signs informing of the direction to the marked destination or destinations using the motorway.
In Czech
The exam is in Czech, so it is worth knowing the Czech name. Below is the official text from Czech law, which is not translated.
Směrová tabule pro příjezd k dálnici (přímo, vlevo nebo vpravo)
Značky informují o směru k vyznačenému cíli (cílům) s využitím dálnice. Na značce lze použít symbol dálnice i samostatně.
Příloha č. 5 k vyhlášce č. 294/2015 Sb., ve znění vyhlášky č. 205/2025 Sb.
Similar signs
IS1aDirection sign for approach to a motorway (straight ahead, left or right)
IS1bDirection sign for approach to a motorway (straight ahead, left or right)
IS1dDirection sign before a motorway slip road (straight ahead, left or right)
IS1eDirection sign before a motorway slip road (straight ahead, left or right)
IS1fDirection sign before a motorway slip road (straight ahead, left or right)