Yashar,

I appreciate your update. I'm curious if it would be helpful for the County to know where TxDOT stands on this issue. The 2007 edition of the AASHTO LRFD Bridge Design Specifications
states in Section 13.9 that the minimum height of a bicycle rail should be 42" (See attached). This is different from previous editions which mandated the use of 54" tall rails. Eventually,
TxDOT released a memo (See the second sentence of the second paragraph on page 2 of the second attachment) in April of 2009 that stated "bicycle-specific rails are no longer necessary
with the recent reduction in minimum bicycle rail height from 54-inch to 42-inch." This action eliminated TxDOT pedestrian/bicycle rails that were taller than 42".

 

In consideration of TxDOT's actions, Halff would recommended the 42" bicycle rail height for the Vitruvian Park project. Is it possible Dallas County would reconsider its position?

 

Please let me know if we can be of further assistance.

 

Sincerely,

Eric Christiansen-

 

 

Eric S. Christiansen, P.E., SECB, LEED AP

Senior Structural Engineer

 

	

	
HALFF ASSOCIATES, INC.

1201 North Bowser Road

Richardson, Texas 75081

Phone 214-346-6284

Fax 214-739-0095

Cell 972-955-2996

www.halff.com

	 

	

 

 

 

 

 

 

 

 

From: Yashar Farahmand [mailto:Yashar.Farahmand@dallascounty.org] 
Sent: Friday, March 12, 2010 1:20 PM
To: Cline, Nancy S.; Christiansen, Eric; Barnett, Clay
Cc: sstrickland@addisontx.gov; Jonathan Toffer; Tushar Solanki
Subject: Bridge Railing Height

 

Afternoon All,

 

After speaking with others here at the county, I found that the minimum railing height that the county is installing on other trail project bridges is 54" and as such that is what the
county would request to see on the Vetruvian Bridges as well.

 

Thank you

 

 

Yashar Farahmand E.I.T.

Dallas County Public Works

214-653-6176