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  1. #1
    Junior Member autocad2010's Avatar
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    Default Plat Map Project

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    Hi Guys,

    I'm new here. I have some questions as I finish my project using autocad2006.

    I'm doing a plat project of lots and roads. It asks that I show centerlines on all roads and streets, what does that mean? do I have to use the LTSCALE ?

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    Super Member MikeScott's Avatar
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    you mean the painted centerlines on the roadways? or a centerline marker for an object?

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    Junior Member autocad2010's Avatar
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    It said:
    Drafting the Plat Map:
    Make a north arrow on the map, show center lines on all roads and streets. I think it means center line marker.

    Then it says: Label all property line bearings, and property line lengths, and all right of way widths.

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    Yeah, I'd agree with that.

    Basically, you just OFFSET the edge of the road to it's center, and give it a new layer/linetype. That's only going to work if the width of the road doesn't vary, otherwise you'll just need to draw a line wherever the center is.

    Of course, I don't know how the streets were initially drawn, and so an offset might not work in your case, regardless.

    LTSCALE will ensure that the dashes and suchlike, in the linetype, show up at an appropriate scale.

    I'd look around for examples to determine what linetypes to use for each thing they're asking you to draw.

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    Default No not the painted ones!!

    Don't forget the crosswalks and stop lines.

    If you have the data points, draw the center line first, then you can just offset the edge of pavement, curb, sidewalk, whatever you need from the center. Then I'd move the different line types to their own layer with the lines and colors already set there.

    It is standard practice to show the physical center of a road on a survey drawing by drawing a Center Line down the middle of it for its entire length. This is the line that is first laid in by the surveyor and everything else measures from it. There are particular line types used in all disciplines of drafting to indicate certain things, and the Center Line is one of the most universal. It looks the same on any mechanical drawing.

    EDIT: I am not sure 2006 has all the following options. I shoulda checked your version before jumping in here, hope some of it helps. You're using 2006? Are you self teaching at work?

    Check your Line Type Control dropdown to see if the Center Line type is there. If not, you will have to load it in from the design center. Click on Other at the bottom of the list, then click Load. Find it on the list and click OK until you have it captured. You can then select the Center Line as your line type. I would create a separate layer just for your center lines. You will need some arcs with the same line type as well. You will probably have to play with ltscale to get it so you can see the breaks in the lines. You will have a short line between two breaks every so often.

    I probably should not have given all the details, but you have your hands full with a survey drawing anyway. Good luck.
    EDIT: I was assuming you are a student.
    Last edited by Dana W; 27th Apr 2010 at 06:41 pm.
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    Yes, I'm a distant student doing the auto cad at Penn drawing the oleson village plat map.

    You are right, I did make a centerline layer that's already dashed. But the question is how do I make it in the middle of the road? and how to make it turn around the arcs?

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    Typically on plat maps the centerline of a road is the center of the right-of-way. The road usually centers on this same centerline but that is not always the case. In the case of interstate highways, state highways, etc. the centerline of the road can be quite different than the right-of-way centerline. Also centerlines only have arcs in them if the road has a curve. If they intersect with another road then the centerline terminates at the centerline of the road it intersects with.

    Roadway delineations (ie. painted markings) are not always the center of the road either. Although typically they are.
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    Junior Member autocad2010's Avatar
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    I have 2 arcs, a road that bends, and a road that intersects with another road with a fillet. So how do I make the centerline for it?

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    What roads are you having problems with?

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    If you scroll to the bottom of this thread you will see other referances to this same drawing.

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