Every once in a while on the streets of Manhattan, I'll see one of these zipping by:
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While I love the idea of parents being able to cycle with their children in tow, as a former first responder I shudder to consider what the safety implications are in the event of an accident.
The following design alternative is certainly no safer, but it is noteworthy in that it's from 1950s Britain:
Today's bicycle trailer/stroller combos are certainly swoopier, in all their variants…
…and I'm guessing folks in 1951 might not have imagined how far we'd take the modifications:
Those last two are hardcore!