Answer:
This is meat from the upper part of a pig's leg salted and dried or smoked, often enjoyed in a sandwich.
They keep secrets locked away. And you pass through them each day. For each one there is a key, They respond to sesame.
Sitting down you have it, Standing up you don't.
If you drive on this, pedestrians and the police will be pretty upset with you.
It covers you, you lose it every day and you'd die without it.
If itβs information you seek, come and see me. If itβs pairs of letters you need, I have consecutively three. What am I?