HopStop, the ever-useful website that helps folks route their best subway and bus routes in various cities, has now rolled out an option for parents and caregivers—and anyone else hauling a stroller—to find the most stroller-friendly routes. You can check the box for "Stroller Friendly" (it's also "Wheelchair Accessible"), which means getting a route that involves more walking and fewer stairs and, if possible, more elevators.

For instance, when mapping our usual work subway commute route, HopStop recommends a transfer at 14th Street from the 1/2/3 to the F. But everyone knows that the transfer is a long warren of many sets of stairs. When selecting the "Stroller Friendly" version, HopStop recommends staying on the 1/2/3 and just hoofing it. Cue the inevitable etiquette question: If you give up your seat for pregnant women, does that mean you are obligated to help people carry strollers up stairs? And if you do opt for a bus, remember you're supposed to fold up the stroller!

HopStop also offers this as an option on its smartphone app. Now, if only HopStop can figure out how many calories are burned by carrying the kid in the stroller up and down the subway station stairs...