On most of the Swiss public transportation system, you can see an iconized eye watching you as you buy your ticket or enter a vehicle. It's supposed to mean that on that particular vehicle, there is no systematic control, only random checks. The picture at the link below clearly depicts the sticker on a retired trolleybus from Geneva:
http://www.legenevois.ch/reportages/tbfbw/depart/P ICT0758001.jpg
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On most of the Swiss public transportation system, you can see an iconized eye watching you as you buy your ticket or enter a vehicle. It's supposed to mean that on that particular vehicle, there is no systematic control, only random checks. The picture at the link below clearly depicts the sticker on a retired trolleybus from Geneva: http://www.legenevois.ch/reportages/tbfbw/depart/P ICT0758001.jpg