Found the below on a saftey web site that may help explain the change but I have to say I think most of the time the LEO's or workers would be against a predominately green background when out on the road. When standing in front of an orange construction vehicle or sign most people would be trying to avoid the vehicle/sign anyway.
Also saw that the color green implies saftey - such as a green trafic light means safe to proceed. While orange is used a caution color throughout most applications.
Just my 2 cents.
High-Visibility Colors:
Workers need a color that will help to differentiate them and make them more conspicuous in their environment. Bright Lime/Safety Green garments may best differentiate workers from orange colored vehicles, signs, and construction barrels; Bright Orange/Safety Orange garments may best differentiate those who work in predominately green areas.
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