Dig Out The Weeds
If your driveway is small enough, one way to prevent weeds is to dig them out by hand.
Lay Mulch Under The Gravel
Mulch is great for preventing weeds in gardens.
Use Landscape Fabric
Like mulch, landscape fabric acts as a weed barrier.
Spray Salt Water
You can spray saltwater on the weeds to kill them.
Use Weed Killer
Weed killer is an affordable and effective way to kill weeds that are growing in a large driveway.