jon, 
Stumbled across this bus picture from METRO A Line BRT in Minneapolis, MN 🇺🇸 in this article https://www.kimley-horn.com/news-insights/perspectives/bus-rapid-transit-design-efficient-urban-transit/
At one level “oooh easy way to carry bikes on a bus”
At another level “imagine you're a pedestrian and get hit by that, and what about the driver's line of sight”
I'm pretty sure this would not be allowed in Europe