Vertical deflections, horizontal shifts, and roadway narrowings shall be used in new roadway design to slow traffic and enhance the street environment for pedestrians. Vertical deflections change the height of the roadway that typically forces a motorist to slow down to maintain an acceptable level of comfort and includes but is not limited to speed humps and raised crosswalks. Horizontal deflections hinder the ability of motorists to drive in a straight path and thus reduces speed. These include, but are not limited to, chicane, realigned intersections, lateral shifts, and mini-roundabouts. Roadway narrowings also slow vehicle speeds and include, but are not limited to, corner extension/bulb-outs, chokers, median islands, and on-street parking.