1. When a roadway\'s Design Daily Traffic Volume in each direction doubles, its
ID: 1711059 • Letter: 1
Question
1. When a roadway's Design Daily Traffic Volume in each direction doubles, its pavement thickness should also doubles. 2. Heavy trucks cause more damage to a roadway's pavement when moving at slower speeds. 3. Commercial vehicles with Single Wheel Axles cause less roadway surface deflection than those with Dual Wheel Axles given that they are carrying the same load weight. 4. Rigid PCC (Portland Cement Concrete) pavements are normally stronger than Flexible Asphalt pavements and more resilient (lasts longer). 5.middot The Base layer in a Flexible pavement do not have to be of high quality materials but the sub-base layer must be. 6. Pavement construction costs will be lowered if the engineer chooses a longer roadway service life time since costs will spread over a longer period. 7. The Surface layer is the most important layer in a flexible pavement. 8. Soils with higher CBR values require less thicknesses of overlaying Flexible pavement layers according to the British Design method. 9. One of the Subbase layer's functions is to protect the pavement from water damage. 10. The greater the tire pressure, the greater a car load is concentrated. 11. The material quality of a Flexible pavement does not affect its pavement thickness. 12. The Vehicle's axle equivalent factor increases with increased axle load.Explanation / Answer
1. Yes, the pavement thickness should also double.hence the statement is true.
2.when moving at slow speeds the damage will be low, therefore the statement is false.
3.double wheel axles can produce more deflections than single wheel axels ,hence the statement is true.
4.rigid pavements are stronger than flexible pavements due to their beam action. Hence the statement is true.
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