Final answer:
Speed limits on country roads vary by jurisdiction but generally range from 45 to 55 mph. Slight exceedances in speed may be informally tolerated due to speedometer inaccuracies, but significantly surpassing the posted limit is unlawful and can result in penalties.
Step-by-step explanation:
To address the question concerning the maximum lawful speed on country roads, it's essential to consult local traffic regulations as speed limits vary by jurisdiction. However, in general, speed limits on country roads can be anywhere from 45 to 55 mph, but it's crucial to observe the specific speed limit signs posted on the road you're traveling. Not adhering to the posted speed limit can lead to traffic violations and tickets.
In certain jurisdictions, like Jacinto City, Texas, you may not necessarily be ticketed for driving slightly above the speed limit, such as 31 mph in a 30 mph zone, because of the allowance for minor speedometer inaccuracies.
As a reference, 100 km/h, a common interstate highway speed limit, is equivalent to approximately 62 mph, considering that 1 mile is equal to about 1.609 kilometers. Nonetheless, exceeding the speed limit, particularly in a manner that compromises road safety, is unlawful and may result in strict penalties.