Following up on my post from earlier today, there is an entire website devoted to ClearViewHwy. Among the other information provided is how to purchase it. It is kind of disappointing that if it was developed in part using state funds that it is not available to the public for free. However, both PTI and TTI seem to affiliated with public universities, rather than being directly affiliated with state governments. So this may be partly a result of »technology transfer«.
I also suppose the various transportation agencies may prefer that the public-at-large has no way of making authentic looking signage themselves. I could elaborate, but I will leave the »denial of service« possibilities to your imagination.