If you have a road bike with crash bars and you can just lay it down,
stay tucked in and you will be OK as a general rule but hitting
something head on is always bad.
The only time I ever laid a bike down or even got hurt was dirt
riding. My Benelli was fun out in the woods but I did crash a few
times
You do realize that a bike sliding on its side has less traction than an upright bike with the
brakes applied. Laying a bike down looks good in the movies, but the bike will stop faster with the
brakes.
I am not talking about intentionally laying it down but that can just
happen if you get to aggressive with the brakes, particularly in the
woods.
OTOH
If you are going to hit something, having tires and springs out in
front is better than counting on your face shield to save you. ;-)