Dual Left Turn lanes - Beginning Taper to one lane
Dual Left Turn lanes - Beginning Taper to one lane
(OP)
We have a condition where we have dual left turn lanes going into the intersection and am looking for guidance on when to begin to taper the two lanes into one lane.
We looked through our state's design guide and also AASHTO design guide and did not find any guidance.
One initial thought was to begin the taper at the point where the vehicles reach the posted speed starting at the beginning of the tangent segment.
We looked through our state's design guide and also AASHTO design guide and did not find any guidance.
One initial thought was to begin the taper at the point where the vehicles reach the posted speed starting at the beginning of the tangent segment.





RE: Dual Left Turn lanes - Beginning Taper to one lane
Your thoughts and experiences are welcome as we have not found much guidance on this issue.
RE: Dual Left Turn lanes - Beginning Taper to one lane
What's your design speed? Is there a two lane through movement onto this leg of the intersection?
RE: Dual Left Turn lanes - Beginning Taper to one lane
The design speed on both legs is 45 MPH. There is a two lane segment approaching the intersection for this movement.
RE: Dual Left Turn lanes - Beginning Taper to one lane
Hope this helps,
Rob
RE: Dual Left Turn lanes - Beginning Taper to one lane