Correct answer
Yes, it reduces reaction capacity.
Yes, they can impair it and alter attention, coordination, perception and decisions needed for driving. Effects vary with substance, dose and circumstances; feeling more alert does not guarantee better responses. Reduced reaction ability does not mean needing less time to react: reaction time may increase, as with alcohol or cannabis. Do not drive under their influence or rely on supposed improvement from stimulants.
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Yes, it improves reaction capacity.
No.
Yes, it reduces reaction capacity.
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