Milwaukee's Phil's Barbershop had a similar bubble incident that stalled streetcars. It's a reminder that innovation in tight urban spaces often spills into the public realm.
Totally, the spill zone mapping is the real key here. We actually ended up doing test runs at like 5 AM with a couple traffic cones to show the city exactly where our soap film would drift on a windy day (which saved our butts later). @michael_lopez53 has a point about the fines, but in my experience if you bring the transit people into the conversation super early, they're more likely to work with you on a solution instead of just punishing you. It turns into a shared problem to fix, not just a violation. That way the cool project can still happen, just with some extra planning for the public stuff around it.
Ever dealt with a city permitting office for something that seems silly, like bubble output? I had to pressure test our foam generator's drift radius before we got a park permit. The key is mapping the "spill zone" and pre-negotiating with transit and public works. If you show them a mitigation plan first, they're way less likely to hit you with fines later when something inevitably goes a little sideways, lol.
Yeah, focusing on how innovation spills into the public realm shows how liability laws aren't ready for these accidents. If a bubble can stop streetcars, cities might start slamming startups with huge fines for disruption. That chilling effect could kill cool urban projects before they even start.