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civilwith-tool

Intersection Timing Grade Sight Distance Package

Calculates task-owned synthetic SSC-01 metrics for one intersection approach, including grade-adjusted stopping distance, sight-distance margin, yellow interval, all-red interval, and pedestrian clearance.

with-tool: The model is given an executable Python calculator script.

Standards

AASHTO Green BookFHWA MUTCD

Tags

civildeterministicintersectionroadsight-distancesignal

How this task is generated

One template produces many comparable benchmark tasks while keeping the scoring contract fixed.

  1. 01

    Template

    The reusable contract shown on this page.

  2. 02

    Scenario

    An archetype and site context are sampled.

  3. 03

    Difficulty tier

    Inputs may be hidden at harder tiers.

  4. 04

    Task prompt

    The model responds with the declared outputs.

Parameters

Inputs the model receives, and the outputs it is scored on.

Inputs

14 inputs

Always given

Included directly in every task prompt.

14
Show 14 inputs

  • Approach speed kmh

    approach_speed_kmh

    SIG-SSC01-002 approach design speed

    60 km/h

  • Approach grade pct

    approach_grade_pct

    PROF-SSC01-002 signed approach grade; downhill is negative

    -3 %

  • Reaction time

    reaction_time_s

    MEMO-SSC01-002 stopping sight-distance reaction time

    2.5 s

  • Braking friction coefficient

    braking_friction_coefficient

    MEMO-SSC01-002 braking friction coefficient

    0.35

  • Available sight distance

    available_sight_distance_m

    INT-SSC01-002 available approach sight distance

    145 m

  • Yellow reaction time

    yellow_reaction_time_s

    SIG-SSC01-002 yellow interval perception-reaction term

    1 s

  • Yellow deceleration

    yellow_deceleration_m_s2

    SIG-SSC01-002 comfortable deceleration rate for yellow timing

    3 m/s2

  • Intersection width

    intersection_width_m

    INT-SSC01-002 conflict area width

    28 m

  • Design vehicle length

    design_vehicle_length_m

    MEMO-SSC01-002 design vehicle length

    6 m

  • All red speed kmh

    all_red_speed_kmh

    SIG-SSC01-002 clearance speed for all-red interval

    50 km/h

  • Pedestrian startup time

    pedestrian_startup_time_s

    PED-SSC01-002 startup allowance

    3 s

  • Crossing width

    crossing_width_m

    PED-SSC01-002 crossing width

    14 m

  • Pedestrian walk speed

    pedestrian_walk_speed_m_s

    PED-SSC01-002 pedestrian walk speed

    1.2 m/s

  • Pedestrian clearance available

    pedestrian_clearance_available_s

    SIG-SSC01-002 available pedestrian clearance interval

    16 s

Scored outputs

8 outputs

Stopping distance

stopping_distance_m

Grade-adjusted stopping distance

Scores if within ±3% of the reference value.

Sight distance margin

sight_distance_margin_m

Available sight distance minus stopping distance

Scores if within ±3% of the reference value.

Yellow interval s

yellow_interval_s

Grade-adjusted yellow interval

Scores if within ±3% of the reference value.

All red interval s

all_red_interval_s

Intersection all-red clearance interval

Scores if within ±3% of the reference value.

Ped clearance required s

ped_clearance_required_s

Required pedestrian clearance interval

Scores if within ±3% of the reference value.

Ped clearance margin s

ped_clearance_margin_s

Available pedestrian clearance minus required clearance

Scores if within ±3% of the reference value.

Grade adjusted braking distance

grade_adjusted_braking_distance_m

Braking distance component of stopping distance

Scores if within ±3% of the reference value.

Overall pass score

overall_pass_score

1.0 when the synthetic sight-distance and clearance checks pass

Scores if within ±1% of the reference value.

Difficulty

Each template is sampled at three tiers. Harder tiers may hide inputs, forcing the model to infer them from the scenario description.

All inputs remain visible at every tier

For this template, difficulty scales through parameter and scenario ranges rather than hidden information.

easy:
All source-pack values visible
medium:
Same deterministic source-pack values with package-level aggregation
hard:
Same deterministic source-pack values with cross-discipline handoff checks

Task bundle

The exact instruction and parameter contract used to generate this task, pinned to the published library source.

/workspace

  • instruction.md
  • intersection-timing-grade-sight-distance-package_calc.py

Teal lines show Jinja input conditions, not task visibility policy. A line renders only when that input or tool is visible.

1You are a traffic-safety engineer checking a task-owned synthetic SSC-01 intersection timing, grade, and sight-distance package.2 3Use only the task-owned synthetic source pack values below for numeric grading. MUTCD and AASHTO-style timing and sight-distance workflows shape the context only; they are not extra data sources for this instance.4 5## Scene6 7- Product: `SSC-01-LH-02`8- Intersection plan: `INT-SSC01-002`9- Vertical profile: `PROF-SSC01-002`10- Signal timing sheet: `SIG-SSC01-002`11- Pedestrian crossing case: `PED-SSC01-002`12- Safety memo: `MEMO-SSC01-002`13- Approach: `NB-APPROACH-02`14 15## Source Values16 17| Item | Value |18| --- | --- |19| Approach speed | {{ approach_speed_kmh }} km/h |20| Approach grade | {{ approach_grade_pct }} % |21| Reaction time | {{ reaction_time_s }} s |22| Braking friction coefficient | {{ braking_friction_coefficient }} |23| Available sight distance | {{ available_sight_distance_m }} m |24| Yellow reaction time | {{ yellow_reaction_time_s }} s |25| Yellow deceleration | {{ yellow_deceleration_m_s2 }} m/s2 |26| Intersection width | {{ intersection_width_m }} m |27| Design vehicle length | {{ design_vehicle_length_m }} m |28| All-red speed | {{ all_red_speed_kmh }} km/h |29| Pedestrian startup time | {{ pedestrian_startup_time_s }} s |30| Crossing width | {{ crossing_width_m }} m |31| Pedestrian walk speed | {{ pedestrian_walk_speed_m_s }} m/s |32| Available pedestrian clearance | {{ pedestrian_clearance_available_s }} s |33 34## Required Calculations35 36- Convert speeds from km/h to m/s.37- Use grade as a signed decimal in the stopping-distance and yellow-interval checks.38- Braking distance is `v^2 / (2 x g x (friction + grade))`.39- Stopping distance is reaction distance plus braking distance.40- Sight-distance margin is available sight distance minus stopping distance.41- Yellow interval is `reaction + v / (2 x deceleration + 2 x g x grade)`.42- All-red interval is `(intersection width + vehicle length) / all-red speed`.43- Pedestrian clearance required is startup time plus crossing width divided by walk speed.44- Overall pass score is `1.0` only when sight distance and pedestrian clearance margins are non-negative.45 46Write a compact memo to `/workspace/output.md`. Include a source-boundary statement that this is a task-owned synthetic source pack. Preserve the source IDs above and state that the baseline source pack passes the current synthetic checks.47 48Do not claim authority approval, accepted project evidence, software export validity, full standards compliance, executable source-pack hardening, generated benchmark readiness, or benchmark readiness.49 50Include a fenced JSON block with exactly these numeric keys:51 52```json53{54 "stopping_distance_m": <numeric_value>,55 "sight_distance_margin_m": <numeric_value>,56 "yellow_interval_s": <numeric_value>,57 "all_red_interval_s": <numeric_value>,58 "ped_clearance_required_s": <numeric_value>,59 "ped_clearance_margin_s": <numeric_value>,60 "grade_adjusted_braking_distance_m": <numeric_value>,61 "overall_pass_score": <numeric_value>62}63```64

Scenario archetypes

Each generated task is drawn from one of these realistic scenario bands.

Site contexts ground each scenario in a real locale the model can use to infer hidden values.

Ssc01 intersection timing

ssc01_intersection_timing

SSC-01 task-owned synthetic intersection timing and sight-distance package

intersection-approach-grade-signal-clearance
Parameter ranges

Example task

intersection-approach-grade-signal-clearance-ssc01-intersection-timing-preview — hard difficulty, all inputs given.

SSC-01 task-owned synthetic intersection timing and sight-distance package. intersection-approach-grade-signal-clearance. Required outputs: stopping_distance_m, sight_distance_margin_m, yellow_interval_s, all_red_interval_s, ped_clearance_required_s, ped_clearance_margin_s

The model sees

Scenario context and visible inputs.

approach_speed_kmh
60 to 60 km/h
approach_grade_pct
-3 to -3 %
reaction_time_s
2.5 to 2.5 s
braking_friction_coefficient
0.35 to 0.35
available_sight_distance_m
145 to 145 m
yellow_reaction_time_s
1 to 1 s
yellow_deceleration_m_s2
3 to 3 m/s2
intersection_width_m
28 to 28 m
design_vehicle_length_m
6 to 6 m
all_red_speed_kmh
50 to 50 km/h
pedestrian_startup_time_s
3 to 3 s
crossing_width_m
14 to 14 m
pedestrian_walk_speed_m_s
1.2 to 1.2 m/s
pedestrian_clearance_available_s
16 to 16 s

Executable tool: intersection-timing-grade-sight-distance-package_calc.py

The model must infer

Inputs withheld at this difficulty.

Nothing. All inputs are supplied.

The model must produce

The scored JSON answer schema.

{
  "stopping_distance_m": <number>,
  "sight_distance_margin_m": <number>,
  "yellow_interval_s": <number>,
  "all_red_interval_s": <number>,
  "ped_clearance_required_s": <number>,
  "ped_clearance_margin_s": <number>,
  "grade_adjusted_braking_distance_m": <number>,
  "overall_pass_score": <number>
}
  • stopping_distance_m · scored within ±3%
  • sight_distance_margin_m · scored within ±3%
  • yellow_interval_s · scored within ±3%
  • all_red_interval_s · scored within ±3%
  • ped_clearance_required_s · scored within ±3%
  • ped_clearance_margin_s · scored within ±3%
  • grade_adjusted_braking_distance_m · scored within ±3%
  • overall_pass_score · scored within ±1%