What is the origin of the idiom "have a lead foot" and when to use it?

The idiom "have a lead foot" originated from the literal sense of lead, a dense and heavy metal, used to describe someone who tends to press the accelerator pedal of a vehicle heavily, leading to excessive speed. The phrase is a colloquial way of expressing a tendency to drive fast or recklessly. Over time, it has become a figurative expression, conveying a person's inclination toward speeding or a lack of restraint when operating a vehicle.