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The Manual on Uniform Traffic Control Devices for Streets and Highways (usually referred to as the Manual on Uniform Traffic Control Devices, abbreviated MUTCD) is a document issued by the Federal Highway Administration (FHWA) of the United States Department of Transportation (USDOT) to specify the standards by which traffic signs, road surface markings, and signals are designed, installed ...
Abrasion may dislodge these beads from the road marking itself, and the reaction of these beads with an aqueous environment vastly accelerates their decomposition and heavy metal release. [citation needed] During both routine road marking removal and harsh environmental conditions, these glass beads can degrade and leach incorporated heavy metals.
The California Manual on Uniform Traffic Control Devices (abbreviated CA MUTCD) is the standard for traffic signs, road surface markings, and traffic signals in the U.S. state of California.
Most state-owned roads and many arterial roads in the state use Botts' dots as the delineation between lanes. They are also used for the dashed marking in passing areas. More recently, Botts' dots have been used in the snow-free areas of Alabama, Florida, Louisiana, Mississippi, Nevada, Georgia, Washington, and Texas.
Signs in the MUTCD are often more text-oriented, though some signs do use pictograms as well. Canada and Australia have road signs based substantially on the MUTCD. In South America, Ireland, several Asian countries (Cambodia, Japan, Thailand, Malaysia and Indonesia) and New Zealand, road signage is influenced by both the Vienna Convention and ...
Route shield pavement markings for Interstate Highways 30 and 35E at the Dallas Horseshoe.. A route shield pavement marking (also called an advance pavement marking [1] or pavement marking shield [2]) is a road surface marking that depicts a route shield and functions as either a road traffic safety measure or a mitigation against street sign theft.
In addition to marking the road edge, delineators are used to mark ramp gores, medians, and objects near the roadway such as fire hydrants. In such areas, the height of the delineators is established based on the typical amount of snowfall the area receives, ranging from 4 feet to more than 8 feet in height in areas with extreme snow depths.
Traffic signs or road signs are signs erected at the side of or above roads to give instructions or provide information to road users. The earliest signs were simple wooden or stone milestones . Later, signs with directional arms were introduced, for example the fingerposts in the United Kingdom and their wooden counterparts in Saxony .