Turning Radius Info On Eighteen Wheelers

    Turning Radius Guidelines for Trucks

    The truck shown is a standard truck used by CXT Incorporated. The information below will help you determine if your building will make it to your site (special arrangements MUST be made for Double Cascadian and Double Cascadian with Chase).

    Standard height of building on the truck is 13’6″. If you have low power line, bridges, tree limbs, etc. please call the Logistics Coordinator at 800-696-5766 for special arrangements. Standard widths change on each building. Please refer to building dimensions for widths.

    Turning Radius

    If your road has tight corners use these steps to help determine if we can access your site with a standard truck.

    Step 1 – Determine angle of the corners and road width requirements.
    If the angle falls between two of the angles listed, use the larger angle.

    Step 2 – Measure road width.

    If your road width is equal to or greater than the width listed on the chart, the truck will be able to reach your site.

    If your road width is less than the dimension listed on the chart please call the Logistics Coordinator at 800-696-5766 for special arrangements.

    This information was developed through the CalTrans Design Manual. If there is any doubt please call CXT for assistance.

    Turning Radius Chart

    Maximum Angle Minimum Road Width

    Minimum Road Width Requirments

    30° 16′ 6″
    60° 24′ 6
    90° 27′ 0
    120° 27′ 0″
    150° 35′ 0″
    180° 33′ 0

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    { 14 comments… read them below or add one }

    Ramon Almaguer December 7, 2009 at 1:37 pm

    I need the radius for a trailer scale design. what is minimum radius for largest trailer?


    Atanaska Leonidova March 9, 2010 at 7:46 am

    I need the radius for a trailer scale design. What is minimum radius for largest trailer?
    The road width is 7.5m


    richie June 26, 2010 at 11:06 pm

    the numbers and the diagram are not exactly true as for a spread axle trailer the number will be much greater


    Roger Angell May 11, 2010 at 5:45 pm

    How wide of a road is required for a truck turning a radius of 70′ for 90 degrees?


    Jeff August 31, 2010 at 1:50 pm

    Anybody out there know what the turning path of a BACKING UP tractor trailer is?


    RAJESH SINGH September 10, 2010 at 6:02 am

    How we can check road radius for truck, bus. or thumb rule


    Arijit Dasgupta December 6, 2010 at 11:03 am

    Currently i am designing the roads inside a refinery. main roada are 9m wide, while the access roads are 6m wide. I would like to know what radius i should adopt at the junction of 9m and 6m wide roads.


    Kev December 15, 2010 at 5:56 pm

    A good rule of thumb I’ve used for the last 10 years with mainly 53′ and 48′ trailers:
    Don’t try to turn around unless you have at least 4 1/2 to 5 lanes of road worth of distance (this has to be kind of eyeballed) or you won’t have enough room to get the tractor all the way turned OR if you three-point turn you will jack-knife and not have enough radius to get the trailer all the way turned. One results in getting the tractor stuck and the other involves getting the trailer wedged in to the side of the tractor.


    Mike Walslh March 12, 2013 at 2:45 pm

    Does anyone know where I can get turning path templates for mine haul trucks?



    Paul March 20, 2013 at 5:31 pm

    Print and scale the above template.A b-double or semi have a minimum of 12.5m(about 41′).Measure your haul trucks preferred radius and apply to the above template.


    Ben September 19, 2013 at 5:26 pm

    There are some software packages that handle turning path. Our company uses AutoTURN and it seems to work quite well. Hope that helps.


    Curtis Marcello May 8, 2013 at 3:33 pm

    any know the required turning radius for a 90′ extendable trailer on a 20′ semi?


    Jenni October 14, 2013 at 2:24 pm

    DOT is relocating the driveway to our facility would you have the radius and sweep requirements for a 53′ Truck/trailer?
    Thank you.


    ralph nisenbaum February 7, 2014 at 10:58 am

    need turning radius for tandem tankers 40′ long each


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