125th Street really, really needs some cross town service.

Something connecting all the way from Riverside Drive/Henry Hudson Parkway passing through the 125th Metro North Railroad station. (...and maybe even shuttling to Randals Island, why not?)

It's faster walking than it is to take the buses that run that route. Cold weather means waiting for the buses sucks, and the only time it's worth a trade is when you're carrying something heavy.

Car service in Harlem is slightly schizophrenic, even with car hailing apps and "boro cabs" (because normal yellow cabs don't operate in Harlem, for reasons I still don't understand...).