The following design process takes a sample complex intersection and details how to understand its existing function, analyze its movements, identify opportunities, and create a new design.
Driving this process is the underlying need to let land use, community desires, and usage determine solutions.
Understand the context within which the intersection functions. Analyze the intersection’s urban design qualities and document specific gathering places, landmarks, transit stations, and other drivers of activity. Engage the public in this process, allowing safety concerns and community visions to drive the ultimate redesign. Document static conditions, such as:
Survey the intersection’s dynamic conditions, or how people are meant to move through the junction based upon existing markings. These elements include:
Map vehicle movements and turns to understand how motorists are using the intersection. Overlay volume data to illustrate the relative importance of each movement, looking for low volume turning movements in particular.
Adapted from the Urban Street Design Guide, published by Island Press.