I have a fairly standard 6 ft privacy fence. Pressure treated 4X4s subk in concrete every 8 ft with 1x6 cedar planks hung on 2x4s attached between posts with metal brackets. Obviously not something that would stop any kind of vehicle. For the parts that run along a road I would like to add some simple and cost effective and preferably attractive reinforcement to the fence to repel a car or truck from crashing through...either by accident or on purpose. I am thinking of running a 1/2 inch steel cable the full length of the fence and attaching it to each post through a heavy eyelet or such. If this is ran at about 24 inches off the ground it seems this might work reasonably well. I will need to reinforce the posts at the ends that hold the tension and a couple more in the middle. Anyone try this and have any suggestions on how to make this most effective while keeping it decent looking and reasonably priced?