A new look for streets and sidewalks at the remade Tysons Corner is set become a template for redevelopment throughout Fairfax County, signaling a move away from traditional suburbia to a collection of mini-cities. Narrow streets would be built instead of wide ones, and wide sidewalks would replace narrow ones. Crosswalks would run mid-street, bike lanes would be the rule instead of the exception, and trees, benches and public art would encourage pedestrians to linger — and spend money — at shops and restaurants.

Such, at least, is the plan designed by the Fairfax County Department of Transportation, charged with developing street design standards for Tysons. The new standards would supersede state standards that are focused on suburban rather than urban lifestyles, county officials said.