← highway ontologyHighway Asset › Alignment and Location System

Vertical Curve

highway.alignment_system.vertical_curve

draftEdit

Definition

Parabolic transition between two gradients on the longitudinal profile.

Class kind: component
Abstract: no
Depth: 2
Origin: reference source
Ontology: engineering-reference-book.highway v0.1.0
Aliases: Summit Curve, Valley Curve, Sag Curve
Abbreviations: —
Last changed: 7/27/2026, 2:50:06 PM

Identification

Positive labels: Vertical Curve, Summit Curve, Valley Curve, Sag Curve
Negative labels: —
Visual features: gradient change on the profile with a curve length callout
Min identity clues: 2

Evidence

Preferred views: longitudinal_section, profile
Evidence types: view, detail, schedule, note, dimension, level, section_callout
Source trace required: yes

Measurements (3)

Name	Symbol	Unit	Required
Curve Length	`L_v`	m	required
Entry Gradient	`g1`	percent	required
Exit Gradient	`g2`	percent	required

Relationships (1)

part_ofhighway.alignment_system.vertical_profile

BOQ items (0)

None — no quantity is derived from this class directly.

Facets

curve_type: summit, valley

Validation

Blocking if missing: no
Human review allowed: yes

no_evidence_no_number
retain_document_page_bbox_and_evidence_id
do_not_mix_drawing_revisions
do_not_average_conflicting_values
prefer_explicit_labels_over_shape_only
match_plan_profile_and_cross_section_when_applicable

Provenance

Basis: taxonomy_spec
Project values included: no
mindmap_module_spec_taxonomy_highway: no page list

Children (0)

None — this is a leaf class and can be deleted.