>Dr Howard Robinson, chief executive of the Road Surface Treatments Association, says most roads in the UK that experience a reasonable amount of traffic will start softening at 50C.
>[...]
>And dark road material can absorb a lot of heat. The typical summer ground temperature is higher than air temperature. Robinson says roads "regularly" reach a temperature of 50C and above. (http://www.bbc.co.uk/news/magazine-23315384) //
50 deg C is 122F; but this is UK with air temps of ~30 deg C
Yeah, I read that too. 30C is 86 F. The OP above mentioned a 100 degree day, 14 degrees warmer, and the formula and paper I referenced above would put the surface temp of the road would also only rise 14 degrees, to 136 F on a 100 degree day.
The OP claimed 150-175 is common on a 100 degree day. No research I can find (except one single author) is anywhere near that amount.
>Dr Howard Robinson, chief executive of the Road Surface Treatments Association, says most roads in the UK that experience a reasonable amount of traffic will start softening at 50C.
>[...]
>And dark road material can absorb a lot of heat. The typical summer ground temperature is higher than air temperature. Robinson says roads "regularly" reach a temperature of 50C and above. (http://www.bbc.co.uk/news/magazine-23315384) //
50 deg C is 122F; but this is UK with air temps of ~30 deg C