Final answer:
The maximum speed limit on Texas Highways outside urban districts varies, with some rural areas permitting up to 75 to 85 miles per hour. Always check posted signs for current limits. Additionally, 100 km/h converts to approximately 62 miles per hour.
Step-by-step explanation:
The maximum speed limit for passenger cars on Texas Highways that are numbered by the State or United States, outside of an urban district, varies. In recent years, some Texas highways have increased their speed limits to as much as 75 to 85 miles per hour in certain rural areas. For an exact speed limit, drivers should always check the current posted road signs as these limits can change based on the specific highway and any local regulations that may apply. When considering conversions, it's important to note that 100 km/h is equivalent to approximately 62 miles per hour, and this can be a common maximum speed limit on highways in various locations, including parts of the United States.