> Sure, technically the tracks are separated from streets, but every so often cars cross anyways or park etc. Those delays propagate to inner-city schedules. I

> Sure, technically the tracks are separated from streets, but every so often cars cross anyways or park etc. Those delays propagate to inner-city schedules. I don't follow your point. It's not like the inner-city tram lines are all perfectly segregated from road traffic and no accidents ever natively happen inside the city limits.