When designing an offramp according to NL design standards, 145 options are used to widen the lane and make a fluent transition between the ongoing lanes and the exit lane:
design,edit gapingen145,b8a2,b8c0,mp30,4= 1800.000,5= 1.000,7= 1800.000,10= 1800.000 (line)145,a8a2,a8c0,mp31,4= 1796.750,5= 1.000,7= 1796.750,10= 1796.750 (carriageway)145,s8a2,s8c0,mp32,4= 1796.700,5= 1.000,7= 1796.700,10= 1796.700 (pavement layers)145,z8a2,z8c0,mp33,4= 1796.600,5= 1.000,7= 1796.600,10= 1796.600 (pavement layers)145,k8a2,k8c0,mp34,4= 1792.850,5= 1.000,7= 1792.850,10= 1792.850 (shoulder)
100,mp30, ,b8a2,4= 0.000,7= 0.000100,mp31, ,a8a2,4= 0.000,7= 0.000100,mp32, ,s8a2,4= 0.000,7= 0.000100,mp33, ,z8a2,4= 0.000,7= 0.000100,mp34, ,k8a2,4= 0.000,7= 0.000
100,mp30, ,b8c0,4= 0.000,7= 0.000100,mp31, ,a8c0,4= 0.000,7= 0.000100,mp32, ,s8c0,4= 0.000,7= 0.000100,mp33, ,z8c0,4= 0.000,7= 0.000100,mp34, ,k8c0,4= 0.000,7= 0.000999
Usually, 145's provide fluent levels between both strings, but in this sequence the mp30 and mp31 create a bump in the design. I will use other design options to smoothen this out, but I'd like to understand the way 145 options assign levels inbetween. Kindest regards, Robin Bongers
Report mp30:
Level Level difference
What program and version are you using? also, can you explain the term levels?
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Hello Nico, this is done in Mx v8i ss2. Levels are z-coordinates.
Hi Robin, can you share your dataset? You can upload it here: https://bentley.sharefile.com/r-rfbbda3697b445d5a
If you only need more information on 145, have you read the help? MXROAD/Reference/LINEMODE/DESIGN>145 Create circular master string. AT the bottom there is an quite detailed explanation on the calculation.
Answer Verified By: RBo
Dear Marc, thank you for your reply. I usually refer to the pdf command language reference in the help directory, but this help file provides a lot of background information. It's just what I need.
For now, I solved my problem with a bunch of 134-104's because I really had to move on (it's actually what the help suggests in case of unstatisfactory level results) but when I have a bit more time I hope to be able to clean up my input with some new knowledge. I'll let you know if I succeed.