speed table n. a flat, raised road surface intended to slow traffic. Editorial Note: A speed table is longer and flatter than a speed bump. It sometimes is a part of, or does double-duty as, a raised crosswalk. (source: Double-Tongued Dictionary)
chicane n. a barricaded, tightly curved, or zig-zagged roadway that forces traffic to slow while still permitting it to pass; the series of structures which form such a roadway. (source: Double-Tongued Dictionary)