Road SAG curves typically occur at the bottom of valleys though can also occur where an uphill grape steepens or becomes less steep. Identifying the SAG curve is particularly important for identifying foreign objects on the road surface, pedestrians and ensuring headlights have sufficient reach to provide the driver early warning of any hazards when driving at night or in poor light/visability conditions.

The Road SAG Vertical Curve Length Calculator allows you to calculate the minimum curve based on varying vehicle and road parameters.

Sight Distance (S) | |

Initial Roadway Grade (g1) | |

Final Roadway Grade (g2) | |

Height of headlight (H) | |

Angle of Headlight Beam (Î²) |

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