Freeze Thaw. That was always a not so popular issue between Asphalt producers and Caltrans. Caltrans spec book said to use an asphalt oil that is more flexible for that issue EVERYWHERE in the state. Not so good in areas that only see a dozen freezes/year (barely freezing at that) and temps over 95 for 6 months of the year. The flexible oil tends to soften in temps like that and the roads rut badly. A neighboring village overlayed a good portion of their city streets and used Caltrans specs. I as an operator, the contractor, our sales peeps, and our lab peeps warned them of the outcome before we started the project. "You know, at every stop sign or signal light that stuff will melt and you'll get humps and ruts and we'll be back doing it allover again in 2 years? Right?" Sure enough, the next summer we were digging that 1 year old AC out and replacing it with material that was more suitable for stop and go traffic. "Well that's what the book said to use so we did". "That's how they do it in Europe" was one of the lame excuses I got from a Caltrans engineer once.