Are you annoyed by a bad intersection? Is there exceptional bike parking at your office? Secret cut through? You can share your knowledge by mapping it here on the Philadelphia Bike Map Wiki.
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Bicycle Crash - Red Cross
Road Hazard - Red Caution Marker
Bike Route - Blue line
Exceptional Bike Amenity - Green Bicycle
Regluation Issue - Police Officer
Bike Friendly Eatery - Food and Drink
High Rail Platform - Train
You need a gmail account to add data. Google also has some tutorials if you don't know how to add information.