Deflectors mounted on the front hood of a car will give protection to the vehicle
from any debris that might be thrown up into its path by another vehicle or by wind. Deflectors fitted to the sunroof and side window areas are mainly for ventilation purposes and to keep those inside the car safe from nature's elements.
Your car is at its most vulnerable from flying objects at the front it doesn't matter what speed you are travelling at- stones, rocks, salt, insects even dust can damage your car and if your on the motorway the damage caused could be even greater than just paint chips, dents, or broken windscreens. These types of damage although they may seem minor at the time can progress into long term and bigger problems especially for the bodywork exposing it to the risk of rust and corrosion. A broken windscreen will not only make vision difficult especially if it happened at night, but replacement costs could be quite expensive. It is also illegal to drive with a broken windscreen at night.
A wind deflector that is specifically designed to fit your make and model of car on the front hood where the car is at its weakest from flying objects will help save the amount of damage by taking the initial impact of any object flying towards you and redirect it away from the vehicle thus reducing the likelihood of any major damage. A deflector fitted to your hood is a wise investment for any drivers that spend a lot of hours on the open road and in all weather extremes. They are a low cost way to stop what could be very high cost repairs.