You may not like it but the ideal main street has no private vehicle lanes, is used for a tramway and the only non tram vehicles allowed on it are emergency services and bikes. And the bikes get their own lanes
And it ends at a large plaza with a confusing public art piece from the 70s that nobody gets and many small shops
Of course, the barrier would be not to high so people can still cross the street but it would be good enough to keep the biker safe
There is, it’s the wide sidewalks I forgot to mention!
