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C3D-0114 · Linework: Centerline road A [LW-CL-A] done

Centerline road A as 1 polyline(s) on SS-V-ROAD-CNTR, max 12 vertices, split at gaps over 45 ft, zero crossings verified against all other runs before posting. Points: 263,260,254

C# payload

// Centerline road A -> SS-V-ROAD-CNTR
//
// survey-linework recipe. Points read from the drawing (C3D-0111), chained nearest-neighbour,
// then: split at any gap over 45 ft (the road is ~26 ft wide with shots every 5-40 ft, so a
// longer hop is a hole in the survey, not curb), capped at 12 vertices per polyline, and
// verified to have ZERO crossings against every other run before posting.
//
// Regular Polyline, never Polyline3d.
const string LAYER = "SS-V-ROAD-CNTR";
var ms = (BlockTableRecord)Tx.GetObject(SymbolUtilityServices.GetBlockModelSpaceId(Db), OpenMode.ForWrite);
EnsureLayer(LAYER, 7);

    {
        var pl = new Polyline();
        pl.AddVertexAt(0, new Point2d(2238231.9730, 1325302.3760), 0, 0, 0);
        pl.AddVertexAt(1, new Point2d(2238219.0610, 1325270.8120), 0, 0, 0);
        pl.AddVertexAt(2, new Point2d(2238205.9980, 1325236.3450), 0, 0, 0);
        pl.Layer = LAYER;
        ms.AppendEntity(pl); Tx.AddNewlyCreatedDBObject(pl, true);
        Log(String.Format("  polyline {0} verts, {1:F2} ft  pts 263,260,254", pl.NumberOfVertices, pl.Length));
    }

int n = 0;
foreach (ObjectId id in ms) {
    var e = Tx.GetObject(id, OpenMode.ForRead) as Autodesk.AutoCAD.DatabaseServices.Entity;
    if (e != null && e.Layer == LAYER && e is Polyline) n++;
}
Log("SS-V-ROAD-CNTR now holds " + n + " polyline(s) (verified)");
Ed.Regen();

Result

  polyline 3 verts, 70.96 ft  pts 263,260,254
SS-V-ROAD-CNTR now holds 1 polyline(s) (verified)