A topic of continuing and fundamental debate is where bikes belong with respect to cars - in series, or in parallel. On some streets, for example Chestnut Street, the roadway is too narrow for parallel riding. Here sharrows seem appropriate. But this raises a serious issue: We are now directing cyclists to take the lane. What kind of cyclist do we envision? Most would say an experienced, vigorous cyclist. How about a 12 year old? A 9 year old? No? Then should we prohibit cyclists under a certain age taking the lane? These are tough questions, but as laws and roads evolve to accommodate cyclists, they will become necessary to address.