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built templatehorizontal-geometrywith-tool

Superelevation Rate

Determines the required superelevation rate and transition development length for horizontal road curves using the point-mass equilibrium equation e + f = V^2/(127*R) per AASHTO Green Book and Austroads AGRD Part 3 Section 7.5. Balances centripetal force demand between pavement banking and tyre side friction to ensure vehicle stability through curves.

inputs

5 fields

context

4 archetypes

engine

with-tool

outputs

2 scored fields

contract fields

Parameter Map

5 inputs to 2 scored outputs

  • design_speed_km_h

    float

    Design speed V

    60 to 130km/h

  • curve_radius_m

    float

    Horizontal curve radius R

    50 to 500m

  • side_friction_factor

    floatfrom archetypehidden in hard

    Side friction factor f

    0.08 to 0.19-

  • lane_width_m

    float

    Lane width w

    3 to 4.5m

  • rotation_rate

    floatoptional

    Maximum rate of pavement rotation (e.g. 1/200 = 0.005)

    0.005 to 0.01m/m
superelevation_rate_pcttol 0.03

Required superelevation rate e (%)

development_length_mtol 0.03

Superelevation development (runoff) length Ls (m)

visibility contract

Difficulty Ladder

all_giveneasy

All parameters given, gentle curve on a rural highway

all fields visible
all_givenmedium

All parameters given, any road type and curve geometry

all fields visible
partialhard

Side friction factor hidden — agent must infer f from road type and design speed

side_friction_factor

scenario bands

Archetype Atlas

rural_highway

3 contexts

Rural two-lane highway with moderate traffic and open terrain

side_friction_factor0.1 to 0.14

bruce-highway-qld / princes-highway-vic / great-western-highway-nsw

urban_arterial

3 contexts

Urban multi-lane arterial road with signalised intersections

side_friction_factor0.13 to 0.17

sydney-parramatta-road / melbourne-hoddle-street / brisbane-coronation-drive

freeway

3 contexts

High-speed divided freeway or motorway

side_friction_factor0.08 to 0.12

m1-pacific-motorway / m2-hills-motorway / western-ring-road-melbourne

mountain_road

3 contexts

Winding mountain road with tight curves and steep grades

side_friction_factor0.14 to 0.19

great-ocean-road-vic / bells-line-of-road-nsw / gillies-highway-qld

rendered task

Generation Preview

bruce-highway-qld-rural-highway-preview

difficulty
hard
visibility
partial
archetype
rural_highway
site context
bruce-highway-qld
instruction excerptsuperelevation-rate_calc.py

visible fields

  • design_speed_km_h60 to 130 km/h
  • curve_radius_m50 to 500 m
  • lane_width_m3 to 4.5 m
  • rotation_rate0.005 m/m

withheld schema

side_friction_factorsuperelevation_rate_pctdevelopment_length_m
Rural two-lane highway with moderate traffic and open terrain. bruce-highway-qld. Required outputs: superelevation_rate_pct, development_length_m