Non-Tangent Curve Nomenclature

I have never used the words Point of Curvature or Point of Tangency. I have used the words beginning of curve and end of curve thousands of times.

99% of all of the highway curves in my county end up being non-tangent. How non-tangent is up for debate and where the road is but they are non-tangent. I quit trying to kill myself about a decade ago trying to force something into it's plans and it was never built in that manner.

Typically I'll intersect tangent lines, back off the tangent distances and do a distance-distance intersection to maintain the radius and let it go. Works amazingly good on railroads so I use it on highways and just call them the beginning/end of curves.

PC & PT are common here in my part of FL for Point of Curvature & Point of Tangency.

BOC is standard here for Back Of Curb. In less urban parts of AK I prusume they don't build a lot of curbing?

In the past, companies I have worked for have used the abbreviation ƒ??PC NTƒ? to describe a Point of Curvature on a Non-Tangent curve.

It is also a common code used by field crews in my area (Western NY) to delineate the start of a Non-Tangent curve when doing line stringing for topographic surveys.

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D Bendell, post: 444533, member: 12975 wrote: PC & PT are common here in my part of FL for Point of Curvature & Point of Tangency.

BOC is standard here for Back Of Curb. In less urban parts of AK I prusume they don't build a lot of curbing?

BOC is also Back of Curb here - it's a context and preference thing.

And... you are correct - there are literally hundreds of thousands of contiguous square miles without a single curb (or asphalt).

JKinAK, post: 444526, member: 7219 wrote: The Department of Minutiae is seeking input for policy development.

Calling out the Point of Curvature as PC and Point of Tangency as PT) are universally standard calls for tangent circular curves.

Iƒ??ve heard the beginning of non-tangent curves called out as
[INDENT]PC (Point of Curvature)
BC (Beginning of Curve)
BOC (Beginning of Curve)
TC (Tangent/Curve)[/INDENT]

Iƒ??ve heard the end of non-tangent curves called out as
[INDENT]PT (Point of Tangency ƒ?? which seems factually incorrect)
EC (End Curve)
EOC (End of Curve
CT (Curve/tangent)[/INDENT]

Where there is no stationing the callout of PC/PT or PT/PC (or other derivatives) is arbitrary.

What do you stamp on caps where a:

[INDENT]Tangent meets a non-tangent curve?

Non-tangent curve meets a tangent?[/INDENT]

THENCE N 15?ø00'00" E 100.00 feet to a point on the arc of a non-tangent curve concave to the Southeast, a radial line of said curve through said point having a bearing of N 73?ø00'00" W;

THENCE Northeasterly along the arc of said curve, to the right, having a radius of 300.00 feet, with a chord of N 32?ø00'00" E 155.29 feet, and a central angle of 30?ø00'00" for an arc distance of 157.08 feet to a non-tangent line;

THENCE N 42?ø00'00" E 100.00 feet to the POINT OF TERMINATION.

Bruce Small, post: 444540, member: 1201 wrote: THENCE N 15?ø00'00" E 100.00 feet to a point on the arc of a non-tangent curve concave to the Southeast, a radial line of said curve through said point having a bearing of N 73?ø00'00" W;

THENCE Northeasterly along the arc of said curve, to the right, having a radius of 300.00 feet, with a chord of N 32?ø00'00" E 155.29 feet, and a central angle of 30?ø00'00" for an arc distance of 157.08 feet to a non-tangent line;

THENCE N 42?ø00'00" E 100.00 feet to the POINT OF TERMINATION.

Are you sure you're not in Texas? Since the original questions was:
[INDENT]What do you stamp on caps where a:
Tangent meets a non-tangent curve?
Non-tangent curve meets a tangent?[/INDENT]
Your must have some mighty big caps 😉

JKinAK, post: 444526, member: 7219 wrote: The Department of Minutiae....
[INDENT]Tangent meets a non-tangent curve?
Non-tangent curve meets a tangent?[/INDENT]

[INDENT]

If this is the DOM....then maybe you can't use the term "tangent meets a nontangent curve" maybe it should be when a straight line meets a non-tangent curve 😉

PC seems like it should be legit, but PT just seems wrong if it's non-tangent (unless you're calling all straight lines tangents whether they are tangent or not which you seem to be doing above) ;^)[/INDENT]

Don't forget P.C.Cs. Some use P.R.C. too. I have been stamping them all P.Cs unless I am doing a ROW survey. The directionality doesn't matter if you are surveying an adjoining parcel, and P.C. is technically correct on both ends and at compound curves.

I don't think it really matters as long as you can tell by looking at the cap what the corresponding corner is on the he plat. Anything is better than a plastic cap with no location information.

I've seen "P.C. A.P." and "P.T. A.P." (Angle Point) used to indicate non-tangencies, though not necessarily on caps. If I were setting anything around here that required it, I would probably use such.