Why do they use different concreting methods for road surfacing?

I'm pretty sure this goe's on everywhere, like where i live, but everytime there's some road re-surfacing going on they use a different technic! Sometimes the loose stone method, sometimes the smooth concrete (which is best by the ways, i cycle loads and this type is best!) and sometimes other methods! Why is this?

Answers:
Primarily cost and durability are a major factor when 'councils' choose to resurface roads. However, as new methods are always being developed, this can have a change in the way the new road is either laid or what it may consist of.
What you are seeing, i think, are different stages in the laying of roads. The old road is either ripped up completely, or the top layer is removed only. Then it is sprayedwith a bonding agent, then it has a layer of hot tar, sometimes two or three, then covered with stone chippings.
If you aware of a new road being laid, go another route for a few days because of the dozens of streetsweepers that will be clearing up the excess chippings that naturally occur when laying road.
it probably depends on road traffic levels and the type of vechicles that use it most commonly.
It all depends on what the road is being used for, loads, traffic amounts etc and whether they are repairing/improving the raod or building new
never heard
it can slo depend as well as traffic amounts, to the ground surface underneath. Shifting sandy soils reuire a harder thicker concrete, where as black top would be unsuitable due to shifting. So geology plays a part.
no idea, but it wouldnt surpirse me if it included:-

-who actually does the job (different contractors may do things in a different manner)
-required finsih (some surfaces are especially 'rough' to improve braking / cornering, some are smoother to improove fuel efficiency)
-amount of time available to do the job (may have limitied time especially if its on a busy road).
-budget, some finsishes are more expensive, so may not get done if its an urgent repair and the budget is already blown.
-changes in government standards/requirements (all those jobsworht employees have got to do soemthing to justify their salaries (so why not invent a new process)
-changes in health & safety legislation AND perhaps nmost scary H&S policies & procedures

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