How should a tram driver behave when driving through places with lowered overhead lines e.g. under a viaduct?
Show the correct answer
Correct answer
A. Reduce speed over the entire section of the lowered overhead lines.
Explanation
This question is about passing through places where the overhead contact line is lowered, for example under a flyover (viaduct). The tram driver should reduce speed over the whole lowered section - the answer is A.
Where the overhead line is lowered, the pantograph has to go down and then rise again, because the contact wire changes height. At high speed, the current collector hits the wire and may bounce off it, spark and damage the overhead line or the contact strip. Driving slowly over the whole lowered section ensures steady, gentle contact between the pantograph and the wire. Increasing speed (answer B) is a mistake, and keeping a constant, normal speed (answer C) does not take into account the danger to the overhead contact line.
Legal basis: Art. 3 para. 1 and Art. 19 para. 1 of the Road Traffic Act (Prawo o ruchu drogowym)