A reaction to a problem is one thing,the trees were under stress of the snow The uprooting may have killed the trees. I would not advise others to top trees,this was in responce to a problem that could have killed them. The trees along the driveway are not under stress,and removing that much of the trees will put them there.The rule of thumb is to cut no more than 25% at one time. Topped trees can regain their original height as fast as two years.The fast growing ,extremely long and loosely attached shoots caused by topping may be more susceptible to breakage and storm damage. Topping immeadiately injures a tree and it starts a downward spiral.Topping wounds expose the tree to decay and invasion from insects and disease. The tree may survive the topping but it's lifespan will be significantly reduced.