|Logged in as: Public User|
The Internet Police kicked me off Linkedin and you guys apparently had some server issues yesterday.
|Other Keywords||Gore Areas|
|Date||April 10, 2015|
The detail you sent from WisDOT is based on our bullnose system that was tested to NCHRP 350 criteria. We do believe that it can be used in gore areas and it has been done in the past. You can get the reports and other details for the system at the links below.
With regards to the start of the taper or flare, we have allowed flaring of the system to begin at post no. 5 with a flare rate of 15:1 based on RDG guidance. That flare may change based on your conditions and the RDG guidance for them.
With regards to the grading, we have addressed this issue in the past by stating that the bullnose itself should be on a maximum grade of 10:1. This applies to cross slopes and v-ditches. We also recommend that the 10:1 slope area be applied for at least 60’ in front of the system to provide for more stable tracking of errant vehicles prior to impact. For the longitudinal slopes prior to the 10:1, we have come up with several options in conjunction with the Minnesota DOT. Can get you those if you need them.
Only one other thing to note. Because the gore installation has similar traffic flow on both sides, you will have to make sure that the thrie beam splices are lapped correctly with the traffic flow on each side of the system. For two way traffic, lapping all of the guardrail the same as it moves around the system is fine. However, with the gore installation, this would cause the splices to be setup wrong along one side. I would suggest simply switching the splice on either side of the nose as needed.
|Date||April 14, 2015|
130 Whittier Research Center
2200 Vine Street
Lincoln, NE 68583-0853
The information contained on the Midwest Roadside Safety Facility (MwRSF) website is subject to change without prior notice. The University of Nebraska and the MwRSF is not responsible or liable, directly or indirectly, for any damage or loss caused or alleged to be caused by or in connection with the use or misuse of or reliance upon any such content, goods, or services available on this site.