Final answer:
The question does not specify the exact speed limit, as it varies by location and legislation. Generally, speed limits can be converted between km/h, m/s, and mi/h for different applications. An example given is converting 80 km/h to both 22.2 m/s and 49.7 mi/h.
Step-by-step explanation:
The question does not provide enough information to determine the maximum speed limit for a taxicab on U.S. or state highways since these limits can vary by state and current legislation. However, for general knowledge related to speed conversions which are part of physics, one can convert speeds between different units. For instance, if the speed limit on an interstate highway is roughly 80 km/h, to convert this to meters per second, you would use the conversion factor that 1 km/h is equivalent to 0.27778 m/s. Multiplying 80 km/h by this conversion factor gives you approximately 22.2 m/s. To convert kilometers per hour to miles per hour, you would use the conversion factor that 1 km is about 0.621371 miles (or approximately 1 mile is 1.609 km). Thus, 80 km/h is about 49.7 mi/h. Understanding these conversions can be helpful in physics problems and practical real-world applications such as understanding speed limits.