Hello:

What's a good rule of thumb for the thickness of Asphalt that one should
request from a paving contractor for a "typical" home driveway ?

How about for the gravel bed underneath the Asphalt ?

BTW: is it considered good practice to (always) remove the old gravel, or
can new Asphalt be simply laid on top of the existing gravel once the old
Asphalt is removed ?

(is it even possible to remove the old Asphalt without taking all of the
gravel bed with it ?)

Thanks,
B.