Disadvantages And Disadvantages Of Skid Resistance And Formal Surfacing Zones

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There are a number of associated disadvantages to using SMA instead of other conventional surfacing materials. Due to the composition of SMA which is binder rich as well as the addition of fibre additives there is an increase in costs. 6.1 - Skid resistance (maybe chapter on its own prior to advantage/disadvantages Overview of skid resistance Skid resistance is the term used to describe what occurs when resistance slows or stops the movement of a tyre along a road surface. (Venkata Rao, et al., 2010) The provision of sufficient skid resistance is paramount to road designers and local authorities. When a vehicle is accelerating or more importantly braking it is the relationship between the tyre and road surface which allows the vehicle to speed up or slow down. Without sufficient skid resistance the driver loses the ability to control the vehicle. Stopping distances will increase as well as vast decreases in the steering and braking abilities of the vehicle. A vehicle’s tyres plays a role in skid resistance such as thread depth and the type of rubber however for this study it shall be the pavements characteristics that affect skid resistance that shall be focused on. The value for skid resistance between a tyre and a dry road , also known as the coeefiecient of friction, tends to quite high circa 0.7. As the road becomes wet this value decreases. In order to get an accurate value for friction on a road, many variables must be considered including the chatarcteristics

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