What is a lead foot?

English Language Tests, Intermediate level

ESL/EFL Test #280 [color=blue]“English Slang Idioms (2)”, question 8

“You are speeding, James. Do you have a foot, or something?” Jane asked her husband.

(a) fake
(b) wooden
(c) club
(d) lead

English Language Tests, Intermediate level

ESL/EFL Test #280 [color=blue]“English Slang Idioms (2)”, answer 8

“You are speeding, James. Do you have a lead foot, or something?” Jane asked her husband.

Correct answer: (d) lead

Your answer was: [color=green]correct
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Do you have lead foot ? I never heard this idiom. I heard club-foot and I thought of it. Lead foot is a heavy foot how is he speeding? I don’t know.

He is pressing heavily on the accelerator.

Hello,
Thanks. I didn’t thought that they are sitting in a car.
Kati