Cant Point Properties

Below you can see the list of properties that are part of each cant point.
  • Object Type: Cant point type, based on its location, Linear, Circular, Transition or Virtual.
  • Station: Station of the cant point. (Can be edited)
  • Point Type: Geometry point type of the cant station. This can be a geometrical cardinal point, (such as TS tangent to spiral) or a cant point type (such as TV, tangent to virtual) or a point on an element (POT, point on a tangent element). To learn more please see Abbreviations.
  • Design Speed: Design speed used in the calculation of the cant point. To see how manipulating this value affects the Speed Table please see Speed Table Integration. (Can be edited)
  • Radius: Radius of the placed geometry, 0 for linear elements. This value is signed, negative for left hand curves and positive for right hand curves.
  • Length: Distance to next cant point.
  • Equilibrium Cant: Equilibrium cant value for the cant point.
  • Applied Cant: Equilibrium cant value for the cant point. (Can be edited)
  • Existing: The existing cant value on the cant point is determined when cant is created on a regression line formed from rails. This value is calculated by averaging the existing cant values over the element range.
  • Calculated: Calculated cant value using the standard cant formula. (see Cant Structure)
  • Projected: Projected cant value, populated when there is projected cant at the cant point location. (see Cant Projection Regions).
  • User: User defined cant value. Populated when cant value is input manually to Applied cant field.
  • Active Value: Sets the Applied Cant value. Options include Reset, User, Projected, Calculated, or Existing. The Reset option automatically chooses the active value based on the following priority order.
    • User > Projected > Calculated > Existing.
  • Cant Deficiency: Cant deficiency (Equilibrium Cant - Applied Cant) for the cant point.
  • Non-Comp Lateral Acceleration: Non-compensated lateral acceleration (aq).

    Where;

    V is the speed in meters/seconds or feet/seconds

    R is the radius in meters or feet

    g is the universal gravity constant, which is 9.8 m/s2 or 32.16 feet/s?

    S is the Centerline Rail to Centerline Rail Distance

    h is the applied cant in millimeters or inches

  • Applied Rate of Change: Rate of change of applied cant.

    V is the speed in meters/seconds or feet/seconds.

  • Deficiency Rate of Change: Rate of change of cant deficiency.
  • Applied Gradient: Gradient of the applied cant. The horizontal distance travelled for a 1 unit of cant change.
  • Rotate About: Cant Rotation Options for the cant point; Inside Rail, Center, Outside Rail, Left Rail, or Right Rail or Force Positive. While changing individual cant point rotations, change multiple points for a curve set together, to get better results. (Can be edited)
  • Cardinal Point: Geometry point type where the cant point is located. This information is used for relocating fixed cant points to correct locations upon changes in the geometry.

    For instance, when underlying curve set is manipulated, a spiral to curve transition (SC) point will find the nearest new location for a SC point in the new geometry.

  • Left Rail: Left Rail elevation in reference to the profile grade line.
  • Right Rail: Right Rail elevation in reference to the profile grade line.
  • Center: Center point location between the rails elevation in reference to the profile grade line.
  • Status: Shows the status of the point. Please also see Cant Point Types.