Which Road Construction Shape Reduces Heat Intake?

I think the fact that roads are black in color is the single most significant factor in heat absorption . Why else do you think I'm such a grouch that I ALWAYS kill anyone who annoys me ?! It's because being permanently sealed inside a black suit of armor is like standing next to an open furnace, that's why !!!!

With quartz aggregate, it is possible to make a road which is white (initially anyway, it soon darkens).

The glare from one of these roads is remarkably tiring.

I think I prefer a black one.

There's a very simple experiment. Go to any large city in late June. Wear sandals. As you come to each type of street, take off your sandals and walk barefoot. You'll notice the differences very quickly.

IF ALL ROADS ARE MADE WHITE, HOW MUCH GLOBAL WARMING WILL REDUCE.?

Why don't you experiment and post the results here ?

I think it will be many years before I have access to a construction yard; if ever again! I could only put plaster models out! If I get hold of a infrared thermometer I wouldn't find enough road variations locally, it's flat for miles. Any suggestions?

From my experience, asphalt roads are significantly hotter in the sun than concrete.

About surface textures such as grooving, I would expect they would make the surface cooler. There is more radiating surface, and more contact with air to carry off heat (where it would still contribute, infinitesimally, to global warming.) Other surface configurations such as wavy or pointed center would have little effect.

Is the heat energy in a road surface (and all surfaces) a worthy sustainable energy initiative

I haven't done the math, but I am pretty sure reducing solar heating of surfaces such as roads isn't really worthwhile. Nearly everything gets hotter in the sun eventually. Greenhouse gases keep that heat from radiating back out into space. And airborne carbon particulates (a newly discovered contributor to global warming) cover huge areas. I would suggest you calculate the square mileage of paved roads worldwide.

However, reducing solar heating of buildings in summertime is worthwhile, because it is easy and we consume energy cooling those buildings. Planting suitable trees to provide summer shade (and block prevailing winds), using light-colored materials for roofing, and installing sufficient insulation are all feasible and potentially worthwhile.

A side effect of black roads is that at night they cool below ambient air temperature.

This often condenses water, which trickles to the side of the road and, in dry conditions, is sometimes the only source of water for miles around for the wildlife (not that kind, they drink alcohol and are prolific around nightclubs).

If you look at the side of a road in a dry area, you will often notice that there is green grass at the edge of the bitumen while all the surrounding bush is bone dry.