ZDC 4-702. General Landscape Standards.

G. Clear Vision Requirements.
1. Street Intersections and Driveway Entrances. Except as otherwise approved in writing by the Public Works Manager, a wall, building, landscape, or other visual obstruction exceeding two (2) feet in height (measured from street curb, see Appendix B for a list of recommended shrubs) shall not be placed within a "clear vision triangle", including street intersections in single-family. Reference the “Corner Site Distance at Intersections” from the Public Works, Transportation Division. There shall be an exception for a reasonable number of trees pruned high enough to permit unobstructed vision.

2. Pathways. Groundcovers and shrubs within six (6) feet of pathways shall not exceed two (2) feet in height at maturity. Between six (6) feet and twelve (12) feet of the edge of pathways, groundcovers and shrubs shall not exceed three (3) feet in height at maturity. See Appendix B and C for a list of recommended plants. There shall be an exception for a reasonable number of trees pruned high enough to permit unobstructed vision.

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A common example:

A common violation for this code is a property with vegetation over two (2) feet in height in a corner that prevents people and automobiles from seeing cross traffic. The violation in this scenario is preventing clear vision and having a mature shrub over two (2) feet high.