Lighted speed limit signs?

[KEK Inc.]

It costed the state $113 million to install about 6 gantries with these bad boys on I-5, and an extra $42 million for 4 gantries on SR-520. 

that seems about an order of magnitude high.  what is the cost breakdown?  42 for 4 implies 10 million per gantry.  call the post and the wiring about 100000, so almost 10 million for 6 signs.  maybe 1.5million per sign?  that seems way high.

http://www.wsdot.wa.gov/Projects/I5/ActiveTrafficManagement/

I'm assuming part of the budget is allocated for maintenance of the signs, which I'm assuming is operated by monkeys in Olympia looking at traffic cameras.

[US12]

This is from the Lodge Freeway in Detroit in 1964! http://www.ebay.com/itm/1964-Press-Photo-Lodge-Freeway?item=251054211752&cmd=ViewItem&_trksid=p5197.m7&_trkparms=algo%3DLVI%26itu%3DUCI%26otn%3D5%26po%3DLVI%26ps%3D63%26clkid%3D8303774152747368734

[HighwayMaster]

This is from the Lodge Freeway in Detroit in 1964! http://www.ebay.com/itm/1964-Press-Photo-Lodge-Freeway?item=251054211752&cmd=ViewItem&_trksid=p5197.m7&_trkparms=algo%3DLVI%26itu%3DUCI%26otn%3D5%26po%3DLVI%26ps%3D63%26clkid%3D8303774152747368734

That's Nice.