Research was performed to establish the rate of corrosion of the zinc coating on highway chain-link fence in four cities around the country. Samples of fence were collected at two kilometer intervals along highways in Philadelphia, Denver, Hartford, and Houston. The cities represented a variety of climatological types and air pollution levels. At the 40 sampling sites in each city the age and original coating specifications were obtained as was information on present and historical levels of sulfur dioxide. Based on results of chemical analysis of the samples, the average corrosion rate within and among cities was determined.