It is also important to note that all minimum turn radii as listed by AASHTO assume a traveling speed of less than 10 mph. (Please note that Turn.lsp currently only supports modeling paths of vehicles with either no trailer or one trailer.) Included with each block library are detailed PDF instructions explaining how to use Turn.lsp with the vehicle blocks. Both block libraries contain all of the AASHTO vehicles that have up to one trailer. Create your own AASHTO vehicle blocks using Turn.lsp's built-in BuildVehicle function or download one of the provided AASHTO Imperial Unit Block Libraries for AutoCAD below.ĪASHTO Imperial Unit Block Libraries for AutoCAD Ī Turn.lsp contributor has provided two Imperial Unit AASHTO vehicle block libraries reflecting both the 20 editions of AASHTO's "Green Book". Using Turn.lsp to create and model AASHTO vehicles and their turn radius paths requires the input of vehicle dimensions and turning radii as listed in AASHTO's "A Policy On Geometric Design Of Highways And Streets", also known as the "Green Book". Submit comments, questions, and bug reports at the Discussion page for this article. Load the file by dragging it into a drawing or by using the "appload" command, then type Turn.Īlso see the videos Automate Turn.lsp for Quick Turning Paths (annotated) and How to Test TURN.LSP posted on YouTube. Or download (possibly not the latest version) from. 2.1 AASHTO Imperial Unit Block Libraries for AutoCADĬopy the Source code section below into a file (turn.lsp) using Notepad.
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