If you are going road cruising in Texas be sure to check the laws first. Pretty much illegal to road cruise at night in Texas. Can't take herps off the road in Texas under any conditions, only the shoulder.
Here is the Texas Parks and Wildlife website. When it starts to cool down cover that heats up quickly, such as tin, can be very productive, particularly in the morning so long as the sun is hitting it. Cover that retains heat, such as rocks, can be very productive in afternoon and in the early hours of the night.