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4.0 Geometric and Safety Design

4.3.2 Survey Results

Q0033 Relative to the mainline through lanes, express lanes:
 
No.
%
Are a continuation
10
91%
Taper to the left
1
9%
Taper to the right
0
0%

 

Q0031 The barrier type installed on the left is (check all that apply)?
 
No.
%
Concrete
8
73%
Guard rail
2
18%
None
0
0%
Other (Earth Berm)
1
9%

 

Q0032 The barrier type installed on the right is (check all that apply)?
 
No.
%
Concrete
7
64%
Guard rail
3
27%
None
1
9%
Other
0
0%

Placing higher speed lanes on the left, consistent with highway travel is most common. However, some agencies have constructed their express ETC lanes on the right side of the plaza to accommodate reversible lanes or to provide staff access to and egress from a median facility (i.e. administration building and parking lot). There are added challenges with this approach, including requiring higher speed traffic to veer to the right, followed by a merge with slower conventional plaza traffic.

 

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Federal Highway Administration - United States Department of Transportation