K53 Prep
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Direction route marker

Guidance GE12.1, GE12.2
Where you'll see it
In urban areas on the opposite side of an intersection near the street name sign or traffic light
What it means
To indicate to drivers the route number of the class-B route
What you must do
Slow down for the intersection and make sure that you take the correct route

Source: Signs manual GE12.1, GE12.2