When my in-laws first saw the honor based public transport system in Munich/Germany they commented that this would probably not work in their home city Taipei/Taiwan.
Yeah, MUNI(cipal railways) of SF, which uses a kind of honor system for buses and above ground LRVs, have a fare evasion rate of 15 to 30%, based on MTA estimates.
Local activists typically lobby against enforcement as they interpret it as targeting a vulnerable population. On the other hand, MUNI is running a deficit.
