What does P.T. represent in roadway alignment?

P.T. stands for "Point on Tangent," which is a critical concept in roadway alignment. In the context of roadway design, it refers to the point where a straight segment of a road (the tangent) meets a curve. This point is essential because it helps engineers define the geometry of the roadway, ensuring smooth transitions between curves and straight sections. Properly identifying and marking the P.T. is vital for accurate construction and maintaining safety and efficiency in traffic flow.

Understanding the P.T. is crucial for ensuring that drivers experience a safe and comfortable change from straight to curved roadways. Careful consideration of P.T. in the design phase helps prevent abrupt changes in alignment that can lead to accidents or discomfort for drivers.