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task library
built templatesight-distancewith-tool

Ssd On Grade

Computes stopping sight distance (SSD) on graded road segments as the sum of reaction distance d_r = V*t_r/3.6 and braking distance d_b = V^2/(254*(f+g)), using speed-dependent longitudinal friction coefficients from AGRD Part 3 Table 5.5. Accounts for uphill and downhill grades to verify geometric design adequacy for safe vehicle stopping.

inputs

3 fields

context

4 archetypes

engine

with-tool

outputs

3 scored fields

contract fields

Parameter Map

3 inputs to 3 scored outputs

  • design_speed_km_h

    float

    Design speed V

    40 to 130km/h

  • grade_pct

    float

    Longitudinal grade (positive = uphill, negative = downhill)

    -10 to 10%

  • reaction_time_s

    floathidden in hard

    Driver reaction time t_r

    1.5 to 2.5s
reaction_distance_mtol 0.03

Reaction distance component d_r (m)

braking_distance_mtol 0.03

Braking distance component d_b (m)

stopping_sight_distance_mtol 0.03

Total stopping sight distance SSD (m)

visibility contract

Difficulty Ladder

all_giveneasy

All parameters given, flat to gentle grade on a suburban arterial

all fields visible
all_givenmedium

All parameters given, any road type including steep grades

all fields visible
partialhard

Reaction time hidden — agent must infer t_r from road type and driver alertness context

reaction_time_s

scenario bands

Archetype Atlas

urban_local_street

3 contexts

Low-speed urban local street with pedestrian activity and on-street parking

design_speed_km_h40 to 60
reaction_time_s2 to 2.5
grade_pct-5 to 5

sydney-residential-street / melbourne-local-road / brisbane-suburban-street

suburban_arterial

3 contexts

Suburban arterial road with moderate speeds and intersection access

design_speed_km_h60 to 80
reaction_time_s1.5 to 2.5
grade_pct-6 to 6

sydney-pennant-hills-road / melbourne-springvale-road / brisbane-waterworks-road

rural_highway

3 contexts

Rural two-lane highway through open terrain with higher operating speeds

design_speed_km_h80 to 110
reaction_time_s1.5 to 2.5
grade_pct-8 to 8

bruce-highway-qld / princes-highway-vic / pacific-highway-nsw

mountain_road

3 contexts

Winding mountain road with steep grades and limited sight lines

design_speed_km_h60 to 100
reaction_time_s2 to 2.5
grade_pct-10 to 10

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

rendered task

Generation Preview

sydney-pennant-hills-road-suburban-arterial-preview

difficulty
hard
visibility
partial
archetype
suburban_arterial
site context
sydney-pennant-hills-road
instruction excerptssd-on-grade_calc.py

visible fields

  • design_speed_km_h60 to 80 km/h
  • grade_pct-6 to 6 %

withheld schema

reaction_time_sreaction_distance_mbraking_distance_mstopping_sight_distance_m
Suburban arterial road with moderate speeds and intersection access. sydney-pennant-hills-road. Required outputs: reaction_distance_m, braking_distance_m, stopping_sight_distance_m