Standard practice is to only allow traffic to be applied to the new mat once the mat has a temperature not exceeding:

Traffic should only be allowed on a new hot mix asphalt (HMA) mat once its temperature is not exceeding 140 degrees Fahrenheit. This practice is important because if traffic is applied to the mat while it is still too hot, it can lead to several issues, including deformation, rutting, and damage to the surface structure.

At elevated temperatures, the asphalt binder is still quite soft, making it more susceptible to compaction under the weight of vehicles. Allowing traffic over a mat that exceeds this temperature can prevent the asphalt from achieving proper consolidation and compaction. Ensuring the temperature is at or below 140 degrees Fahrenheit helps the HMA maintain its structural integrity and performance over time, which is crucial for longevity and durability of the pavement surface.

Additionally, this temperature guideline helps manage operational safety. If the mat is too hot, workers and vehicles passing over it may face risks due to soft asphalt, so temperature management also enhances on-site safety. Following these standards is part of best practices in asphalt paving to ensure high-quality surface outcomes.