We live a little further down, on Pymers Mead. Traffic is terrible (always has been, but worse since the introduction of the Southwark LTNs). It's mainly the school drop -- traffic is noticeably lighter once the private schools break up
Have a few friends who live on that side of CR backing on to the train line. None has had any major complaints and the gardens on that stretch are fairly long, so you're not right on the line. Some have kids who go to Charter North -- its catchment defintely extends to Croxted Road. Other state secondaries nearby are Elmgreen and, of course, Kingsdale, although that doesn't have a catchment -- pure lottery