Final answer:
The maximum speed limit varies by roadway and locale, with interstate highways often having a limit of around 100 km/h, or 62 mi/h.
Step-by-step explanation:
The maximum speed limit at which you are permitted to travel in ideal road conditions can vary based on the type of roadway and local regulations. For example, the speed limit on some interstate highways is roughly 100 km/h, which translates to about 27.8 m/s (1 m/s is equivalent to 3.6 km/h) and approximately 62 mi/h (as 1.0 mile is about 1.609 km).
In towns and cities, a common speed limit is 60 km/hr (or about 16.7 m/s and 37.3 mi/h). However, each locality can set its own speed limits, and enforcement can vary, with the de jure speed limit being the legal limit while the de facto speed limit may include a small amount of leeway before enforcement action like a traffic ticket is taken.
Regarding safety, it is vital to assess the speed of oncoming vehicles if you consider crossing the road outside of a pedestrian crossing, as the risk increases with the vehicular speed.