The correct answer is: A. Local
Computer-based traffic control systems are implemented at the local level of government. This is because these systems are designed to address specific traffic problems in a particular area. For example, a city might implement a computer-based traffic control system to reduce congestion at a particular intersection.
The other options are incorrect because they do not accurately reflect the level of government at which computer-based traffic control systems are implemented. Option B, “Top,” is incorrect because computer-based traffic control systems are not implemented by the federal government. Option C, “Bottom,” is incorrect because computer-based traffic control systems are not implemented by individual citizens. Option D, “Top-to-bottom,” is incorrect because computer-based traffic control systems are not implemented by the federal government and then implemented by individual citizens. Option E, “None of the above,” is incorrect because one of the options is correct.