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In Philadelphia, planners have been experimenting with a new way of slowing drivers down: painted 3­D triangles that look like speed bumps. At onequarter of the cost of physical bumps, the devices also have the advantage of not tearing up emergency vehicle axles as they speed overn them. A month of investigation on a half­mile stretch of road found that driver speeds fell from an average of 38 miles per hour to 23 miles per hour. While this drop is impressive, the effect may be temporary as drivers, particularly those who regularly travel that route, to learn which bumps are just illusions.

Q) How can the underlined part be corrected?
Are these two possible? "will learn," "learn."
Are there other options?
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Hi,

Q) How can the underlined part be corrected?
Are these two possible? "will learn," "learn." Yes. But I think the most likely choice is 'learn'.
Are there other options?
Sure.
eg discover / see / find out.

Clive
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Q) My student wrote an answer "fell down" instead of "fell" in the underline above. Should I get it right without penalizing some points? Or should I not get it right?-- 'Fell down' is wrong here.
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Hi,

I have another question from the same passage.

In Philadelphia, planners have been experimenting with a new way of slowing drivers down: painted 3­D triangles that look like speed bumps. At onequarter of the cost of physical bumps, the devices also have the advantage of not tearing up emergency vehicle axles as they speed overn them. A month of investigation on a half­mile stretch of road found that driver speeds fell from an average of 38 miles per hour to 23 miles per hour. While this drop is impressive, the effect may be temporary as drivers, particularly those who regularly travel that route, learn which bumps are just illusions.

Q) My student wrote an answer "fell down" instead of "fell" in the underline above.
Should I get it right without penalizing some points? Or should I not get it right?
 Mister Micawber's reply was promoted to an answer.
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Can "fell down" only be used in this situation: I fell down and hurt my knees.
Hi,

Yes, that's the general idea.

Clive