I'll be visiting Philly for a few days sometime in the fall and was considering whether or not to bring my bike. Is this a good idea? I'll be staying probably around the Italian Market, Bella Vista or Passyunk areas and visiting Center City, Chinatown, Logan Square, the historic district and the vicinity. How is traffic in and around Center City, especially after dark? Is it less busy than in daytime? South Broad, from what I understand, can be dangerous with high speed traffic and careless drivers. Am I naive to think that part of the city is fairly safe in terms of crime after dark?