Sinn 917 GR, Инструкция по эксплуатации

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Precision work: The time trial
regularity rallies, also called time-speed-distance rallies (tSd), are a type of
time trial. they are indicated by a yellow road sign (tSd 1/100). at the sign-
post, an official gives the drivers a hand signal telling them when to start.
time is recorded beginning after a few meters, coinciding with a red flag
signal when the vehicles pass a photoelectric sensor or pressure hose sensor.
the co-driver presses the stopwatch at this starting line and begins measuring
the target time. the team should continue driving once the tSd has been
completed so as not to hinder the vehicles behind it.
Lichtschranke = Photoelectric sensor
Schlauch = Pressure hose sensor