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Yes. Apart from anything else, there is the speed of light!
Yes. Going under the speed limit is (-) going over the speed limit is (+) going on the speed limit is (0)
You can be ticketed for failure to adjust speed to traffic conditions.
Yes they have to follow a certain speed limit while they are going through a town,city,or even a suburb. * Added - In the US, for every train line and for every train there are speed limits both imposed by regulation and by railroad rules. By Federal regulation, trains are limited to certain speeds based upon the condition of the track and how often it is inspected. In addition, depending upon the type of train and the particular locomotives and cars in the train, Federal regulations and railroad rules impose speed limits. The most restrictive speed limit, meaning the slowest, that applies to the train is the speed limit the train must obey. Additional speed limits that reduce the speed further may be imposed temporarily or permanently for many reasons.
Whatever the speed limit for any other vehicle on that roadway is. Most of the Interstate there has a 75 MPH speed limit (except when going through cities), and you're allowed to drive 75 (provided your truck isn't governed below that).
Yes, many state highways have a minimum speed limit.
No. Speeds are established by the railroads to be safe, and are based on track conditions, grades, curves, crossings, etc. Towns do not have the authority to regulate the speed of a train passing through.
This question makes no sense, what do you mean? the speed of the car does not dictate the posted speed limit.
If you are noted and apprehended by a law-enforcement officer, then you can be cited for going through the red light. Your speed at the time is irrelevant.
The speed limit through a school zone can vary depending on location. Usually, the speed limit is between 15 and 25 miles per hour.
The fastest vehicle.
No.