What movement are baffles in a liquid tank designed primarily to control?
Correct answer: B – Forward-and-backward liquid surge
Baffles are bulkheads with openings that permit liquid to flow through them. They help reduce forward-and-backward surge when the tank vehicle accelerates, slows, or stops. They do not eliminate side-to-side surge, which can still contribute to a rollover if the vehicle is driven too fast or turned abruptly.
Source: New York State Commercial Driver’s Manual — § 8.2.4, “Baffled Tanks” ([dmv.ny.gov](https://dmv.ny.gov/brochure/cdl10sec08.pdf))

