Urban environments with relative narrow streets surrounded by large buildings provide a very short window of communication between any 2 nodes moving with high speed on different streets. This short communication window causes many routing protocols to require many network wide route requests to constantly reestablish routes or require more frequent location exchanges among nodes causing wireless medium congestion. Although an earlier work called Connectionless Approach to Mobile Ad Hoc Network (CLA) can work well in high mobility environment, it cannot be applied directly to urban environments because buildings often block direct path between any two nodes. The contribution of this paper is to adapt CLA to urban environments. We name our technique ConnectionLess Approach for Streets (CLA-S). The proposed CLA-S approach can relay data around obstacles, can quickly adapt to topology change, can utilize short communication windows, and can provide multiple communicating paths to the destination.