In Texas, speed limits can vary significantly depending on the type of road and specific conditions. The general maximum speed limit on state highways is set at 70 mph (113 km/h), but exceptions can apply, allowing for higher speeds, particularly on highways designed for such use. The regulation is designed to enhance the flow of traffic while also ensuring safety, striking a balance between efficiency and accident prevention.

The specific threshold of 137 km/h (85 mph) comes into play on certain highways built for higher speeds, reflecting considerations of road design and traffic studies. This approach indicates a move towards a more nuanced understanding of speed regulations, wherein the law adapts to the physical characteristics of the road and the expected behavior of drivers. Hence, while drivers may enjoy the thrill of increased speed, the law also serves to remind them that safety remains paramount.

Moreover, the implementation of these speed limits draws on technical studies and engineering assessments. The idea is not only to promote faster driving where appropriate but also to employ smart traffic management that aims to decrease accidents by setting speed limits that align with road conditions. Ultimately, drivers are expected to exercise caution regardless of the speed limit, highlighting the dual responsibilities of both the law and the driver in maintaining road safety.