Trams work great if you do them right:
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Give them priority at crossings, so when a tram arrives at a crossing the traffic lights jump to red for all other traffic.
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Separate the tracks from traffic, preferably give them a grassy lane in the center of the street so cars can never stand in the way.
M10 certainly doesn’t have 1 and in many places doesn’t have 2.
‘How about you just start a restaurant’ vibes.