What is the hand signal for prohibiting vehicles ahead from passing?

[LeChristopher]

The hand signal for prohibiting vehicles ahead from passing is to extend the left arm straight upward with the palm facing forward. Below is relevant information about the passing scores for the driver's license test: Subject 1: Road traffic safety laws, regulations, and related knowledge exam. Written test, computer-based, full score of 100, 90 or above is passing (including 90). Subject 2: Field driving skills test. In-field practical driving, only pass or fail. Includes reverse parking, parallel parking, S-curve, right-angle turn, and hill start and stop. These five items are mandatory and conducted in sequence. Full score of 100, 80 or above is passing (including 80). Subject 3: Road driving skills test. Highway or simulated field practical driving. Full score of 100, large buses require 90 or above, large trucks 80 or above, other vehicle types 70 or above to pass. Subject 4: Safe and civilized driving related knowledge. Written test, full score of 100, 90 or above is passing (including 90).