There's also a safety issue. When people in wheelchairs or on scooters board buses, protocol dictates that the driver secure the vehicles with straps. That's a precaution for both the person in the wheelchair and the other riders — but no such steps will be taken for strollers, which means that if the bus comes to quick stop or there's an accident, the stroller could go flying. A parent can't secure a baby and a stroller at the same time. Trust me, parents, no one wants you barging onto a crowded bus wielding a rolling agent of pain.