Opening bridge Beweegbare brug
De regel · The rule
When the bridge lights flash red, stop before the stop line: the barriers come down and the bridge opens.
RVV 1990 art. 71 · sign J15

Why this rule exists
An opening bridge is a level crossing for boats: never be on it when it moves.
Test yourself
Kees' three questions on this rule, the “Wist je dat?” facts and his tip come with the drive, in Voorrah! Pro.