Some do. Michigan has had it since 1974 [0]. Of course, it was a bit less dependent on technology when it started.<p>[0] <a href="http:&#x2F;&#x2F;www.michigan.gov&#x2F;mdot&#x2F;0,1607,7-151-9615_11228_11234---,00.html" rel="nofollow">http:&#x2F;&#x2F;www.michigan.gov&#x2F;mdot&#x2F;0,1607,7-151-9615_11228_11234--...</a>