مدونة عبدالله مفرح : المطبات في السعودية

كلنا يعرف فوائد مطبات تهدئة السرعة أذا صممت حسب المواصفات ورعي استخدام المواصفات الفنية عند اختيارها وتنفيذها ولكن السؤال :

لماذا يوجد نظام ولا يطبق ؟؟؟؟؟؟؟؟؟؟؟؟

From Internet :

Speed humps are gently raised strips on the roadway that encourage you to reduce your speed. Humps are used on the road where vehicles are traveling above 20 miles per hour (mph) and encourage you to reduce your speed to 15 to 20 mph. Speed bumps are more severely raised strips. Bumps are usually used in parking lots where you are traveling less than 15 mph. You may need to slow to 5 mph to safely navigate the bump. Using a speed bump where speed limits are over 20 mph would cause damage to the vehicles traveling on the roadway.

The FHA recommends the best speed hump design is one that gradually slopes. A 12-foot-wide speed hump that slopes gradually enough to make a four-inch change in vertical elevation is enough to reduce potential vehicle damage and reduce the amount of jarring experienced by the driver and passengers while still encouraging you to slow down. Speed humps should not be installed in the path of pedestrian crossings or curb ramps.

A speed hump warning sign should be 30-by-30 inches for a single-lane roadway or 36-by-36 inches for a multi-lane roadway. The minimum size sign is 24-by-24 inches and the maximum size is 48-by-48 inches. The speed hump sign should be accompanied by an advisory speed plaque to notify you of the suggested speed for traversing the hump.

Speed hump markings, if used on the roadway, must be white and placed on the hump to enhance its visibility. The markings should be 12 inches wide and form an arrow in the direction of travel.

Markings leading up to the hump should be a series of 12-inch-wide, transverse lines that become longer and are placed closer together as they get closer to the hump.

Speeds humps are a low-cost speed control design that are generally used on residential streets. Placement of the speed hump should take into consideration the roadway drainage, potential noise if the route is used by large vehicles, aesthetics, sight distance limitations and whether or not the roadway is a bus route, primary emergency vehicle route or emergency evacuation route.