I was wondering, does anyone know which states use the mechanical rotating prism dynamic message signs? This is one of the oldest technologies of dynamic message signs still in use, and are actually still being manufactured today although they are much less popular than they were in the past. They seem to be most commonly found at bridges and tunnels.
When I lived in Hampton Roads from 1994 to 2001, I know for a fact they were used at the Berkeley Bridge/Downtown Tunnel complex. Looking at Google Street View, it appears they have since been replaced by LED signs. I think when I first moved there I think they may have also been used at the Hampton Roads Bridge Tunnel until the mid/late-1990s (the HRBT was one of the first highway segments in Hampton Roads to get LED DMS, since I remember them as early as 1998).
Quote from: Pink Jazz on December 03, 2015, 10:40:51 PMI was wondering, does anyone know which states use the mechanical rotating prism dynamic message signs? This is one of the oldest technologies of dynamic message signs still in use, and are actually still being manufactured today although they are much less popular than they were in the past. They seem to be most commonly found at bridges and tunnels.
TxDOT called for them in a major reconstruction of US 59 in Houston for which the construction contracts were advertised beginning in summer 2002. I think they may have been called for as part of the I-10 Katy Freeway widening as well, but I think it is quite possible any such signs called for in the plans were in fact not installed, since the original Katy Tollway concept was later dropped in favor of I-10 express lanes.
The New Jersey Turnpike famously uses these.
theres a few in Pittsburgh on I-376 and I-579
Do you mean this like in Chicago?: https://www.google.com/maps/@41.8907473,-87.6502501,3a,75y,338.52h,91.94t/data=!3m6!1e1!3m4!1sxapDZRHd0VuhxSXZ8pL7bw!2e0!7i13312!8i6656
Quote from: Big John on December 04, 2015, 07:59:39 PM
Do you mean this like in Chicago?: https://www.google.com/maps/@41.8907473,-87.6502501,3a,75y,338.52h,91.94t/data=!3m6!1e1!3m4!1sxapDZRHd0VuhxSXZ8pL7bw!2e0!7i13312!8i6656
Yes, that is what I am talking about.
Before the new I-280 bridge was built over the Maumee River in Toledo, ODOT had them installed to warn vehicles if the drawbridge was raised or congested.
To the extent that you only need to display a limitied number of messages, I prefer these to the electronic VMS, because they are more readable.