On a typical weeknight, Center City's streets are clogged with cars navigating alongside people on foot and bikes. Truck deliveries in the city and the growth of Uber and Lyft mean more vehicles blocking travel lanes. Along with being frustrating, congestion is dangerous. Stretches of Walnut and Chestnut Streets in Center City were among those included in a city survey of streets where many of the city's serious traffic-related injuries happen.