|TO:||All Design Section Staf|
|FROM:||C. C. Ruth|
|DATE:||November 1, 2000|
Section 8.3.2A is supplemented with the following:
6. When designing and detailing bridge traffic barrier orientation on a superelevated bridge deck, the following guidelines shall be used:
a. For bridge decks with a
superelevation of 8% or less, the traffic barriers
(and the median barrier, if any) shall have an orientation that is perpendicular to the bridge deck.
b. For bridge decks with a
superelevation of more than 8%, the traffic barrier
on the low side of the
bridge (and median barrier, if any) shall have an orentation that is perpendicular to an 8% superelevated
bridge deck. For this situation, the traffic barrier on the high side of the bridge shall have an orientation
that is perpendicular to the bridge deck.
When the superelevation of a bridge deck exceeds 8%, the effectiveness of the bridge traffic barrier oriented perpendicular to the bridge deck on the low side of the bridge is diminished. The above guidelines have been discussed with and approved by the Dick Albin in the Design Office and Dennis Elkhart, the FHWA Safety Engineer.
J. A. Weigel - 47340
Rick Brice - 47340