Transportations Library

A comprehensive Rust-based library implementing transportation engineering methodologies (e.g. the Highway Capacity Manual (HCM)) with Python bindings.

Transportation engineering knowledge is siloed. The methods live in PDF manuals, agency spreadsheets, and closed desktop tools, and every consumer re-implements them, so the same HCM procedure yields different numbers in different shops with no way to trace which one follows the book. This library is the source-of-truth layer of the CrossTraffic stack. Each methodology is implemented once, with the equation or exhibit it implements cited at the definition, validated against the manual's published example problems, and released under a matched version line so the downstream surfaces (the Python bindings here, the WASM middleware, the MCP server, the web calculator) integrate one canonical computation instead of maintaining diverging copies. Data management concerns that usually stay implicit are handled explicitly. Edition differences are selectable rather than silently mixed, published errata are applied and documented, and the places where the manual is ambiguous or not reproducible from its printed procedure are recorded rather than papered over.

What this covers

Highway Capacity Manual 7th Edition computational chapters 10 through 24, with the supplemental chapters (25, 27, 28, 30, 31, 32, 33, 34, 35) they draw on:

Chapter	Topic	Chapter	Topic
10	Freeway Facilities	18	Urban Street Segments
11	Freeway Reliability	19	Signalized Intersections
12	Basic Freeway and Multilane Segments	20	Two-Way STOP-Controlled Intersections
13	Freeway Weaving Segments	21	All-Way STOP-Controlled Intersections
14	Freeway Merge and Diverge Segments	22	Roundabouts
15	Two-Lane Highways	23	Ramp Terminals and Alternative Intersections
16	Urban Street Facilities	24	Off-Street Pedestrian and Bicycle Facilities
17	Urban Street Reliability

Methodologies are validated against the manual's own published example problems; see docs/hcm/procedures/ for per-chapter walkthroughs and docs/hcm/VERIFICATION.md for the places where the manual is ambiguous, self-contradictory, or not reproducible from its printed procedure.

Selecting an HCM edition

Edition 7.1 (November 2025) replaces Chapters 13, 14, 27, and 28 with new weaving, merge, and diverge methodologies. It does not supersede the rest of the manual, so the edition is selected per segment rather than globally, and defaults to the 7th Edition:

import json, transportations_library as tl

tl.hcm_versions()          # ["7", "7.1"]
tl.hcm_latest_version()    # "7.1"

seg = tl.WeavingSegment(version="7.1", length_short=1500.0, num_lanes=4, ffs=65.0,
                        v_ff=1815.0, v_fr=692.0, v_rf=1037.0, v_rr=1297.0,
                        phf=0.91, heavy_vehicle_pct=0.05,
                        lc_rf=0, lc_fr=1, nw_rf=2, nw_fr=1)
seg.run_analysis()                       # "C"
json.loads(seg.analysis_v7_1())["speed_avg"]   # 59.32 mi/h

The two editions are different models, not successive refinements: the same segment can land a full LOS letter apart between them. tl.hcm_version_changes_chapter("7.1", 19) returns False, because Edition 7.1 left Chapter 19 alone.

Installation

Prerequisites

Rust: Install from rustup.rs
Python: 3.10 or higher
UV: Modern Python package manager (recommended)

Using UV (Recommended)

# Clone the repository
git clone https://github.com/crosstraffic/transportations-library
cd transportations-library

# Create and activate virtual environment
uv venv
source .venv/bin/activate  # On Windows: .venv\Scripts\activate

# Install in development mode
uv pip install maturin pytest
maturin develop --release

Using pip

# Install dependencies
pip install maturin pytest

# Build and install
maturin develop --release

From PyPI

pip install transportations-library

Quick Start

For Two Lane Highways.

Python Usage

import transportations_library as tl

# Create a highway segment
segment = tl.Segment(
    passing_type=0,     # Passing Constrained
    length=1.5,         # 1.5 miles
    grade=2.0,          # 2% grade
    spl=55.0,           # 55 mph speed limit
    volume=800.0,       # 800 veh/hr
    phf=0.95,           # Peak hour factor
    phv=5.0             # 5% heavy vehicles
)

# Create highway facility
highway = tl.TwoLaneHighways([segment])

# Perform complete analysis
seg_num = 0
demand_flow, opposing_flow, capacity = highway.determine_demand_flow(seg_num)
ffs = highway.determine_free_flow_speed(seg_num)
avg_speed, _ = highway.estimate_average_speed(seg_num)
percent_followers = highway.estimate_percent_followers(seg_num)
follower_density = highway.determine_follower_density_pc_pz(seg_num)
# Exhibit 15-6 picks its threshold set by POSTED SPEED LIMIT, not average speed
los = highway.determine_segment_los(seg_num, highway.segments[seg_num].spl, capacity)

print(f"Level of Service: {los}")
print(f"Average Speed: {avg_speed:.1f} mph")
print(f"Follower Density: {follower_density:.1f} followers/mile")

Subsegment sections.

# Highway with horizontal curves
subsegments = [
    tl.SubSegment(length=2640.0, design_rad=800.0, sup_ele=4.0),  # Curved section
    tl.SubSegment(length=2640.0, design_rad=0.0, sup_ele=0.0)     # Tangent section
]

segment_with_curves = tl.Segment(
    passing_type=0, length=1.0, grade=3.0, spl=55.0,
    is_hc=True,  # Has horizontal curves
    subsegments=subsegments,
    volume=900.0, phf=0.92, phv=8.0
)

highway = tl.TwoLaneHighways([segment_with_curves])
# ... perform analysis

Parameter Constraints

The library exports all HCM/AASHTO parameter constraints as JSON, which can be used by validators and knowledge graphs:

import transportations_library as tl
import json

# Get all constraints
constraints = json.loads(tl.get_constraints())
print(f"Version: {constraints['version']}")

# Access specific constraint
lane_width = constraints['two_lane_highways']['lane_width']
print(f"Lane width: {lane_width['min']}-{lane_width['max']} {lane_width['unit']}")
print(f"Source: {lane_width['source']}")
# Output: Lane width: 9.0-12.0 ft
# Output: Source: HCM 7th Edition, Exhibit 15-8

# Validate inputs directly
errors = tl.validate_input(lane_width=8.0)  # Invalid - below 9 ft
print(errors)
# Output: ['lane_width = 8 ft is outside valid range [9, 12]. Source: HCM 7th Edition, Exhibit 15-8']

Available constraints include:

lane_width, shoulder_width (range)
passing_type, horizontal_class, vertical_class (enum)
grade, phf, phv, speed_limit (range)
speed_radius (table lookup - AASHTO Table 3-7)

Using from Rust, Python, and JavaScript

The same compute core is reachable from three languages, and the mapping is mechanical:

Rust is the source of truth. Every chapter lives under src/hcm/, and the structs there (BasicFreeways, WeavingSegment, RampSegment, ...) are the API. Add the crate as a dependency and call the run_analysis/step methods directly.
Python bindings are generated from the same structs via PyO3 (src/copython/), built with maturin. Field names, defaults, and units are identical to the Rust side; constructors take the struct fields as keyword arguments, and enums map to strings (version="7.1", terrain="level"). A Rust method returning Option<T> returns None in Python.
JavaScript goes through WebAssembly, but not from this repo: cross-traffic-middleware wraps these structs in wasm_bindgen types (WasmBasicFreeways, WasmRampSegment, ...) and is built with wasm-pack. The same Option<T> becomes undefined. The web calculator is the reference consumer.

One convention to know when porting numbers between languages: percentages are percent in the UI-facing bindings and decimals in Rust where the HCM equation wants a proportion; each binding's docstring states which it takes. Editions, LOS letters, and every published-example value are identical across the three surfaces, and the integration tests assert the Rust and Python sides against the same JSON fixtures in tests/ExampleCases/.

Testing

Run Tests

# Rust tests
cargo test

# Python tests
pytest tests/

# With coverage
pytest tests/ --cov=transportations_library

# Integration tests for chapter 15
cargo test --test chapter15_integration

Note: If you want to have changes in the Rust code to be reflected in Python, you need to run cargo clean and maturin develop again after making changes.

Example Test Cases

The library includes comprehensive test cases based on HCM examples:

Case 1: Basic passing constrained segment
Case 2: Segment with horizontal curves
Case 3: Multi-segment facility with different passing types
Case 4: Steep grade conditions with heavy vehicles

Development

Project Structure

transportations-library/
├── src/
│   ├── hcm/
│   │   ├── chapter15/           # Two-lane highways implementation
│   │   └── common.rs            # Shared HCM utilities
│   ├── copython/                # Python bindings
│   ├── utils.rs                 # Mathematical utilities
│   └── lib.rs                   # Library root
├── tests/                       # Integration tests
├── examples/                    # Usage examples
└── Cargo.toml                   # Rust configuration

Building from Source

# Development build
cargo build

# Release build
cargo build --release

# Build Python wheel
maturin build --release

# Development install with changes
cargo clean && maturin develop --release

Pipeline

The project uses GitHub Actions for CI/CD, including:

Running tests on push and pull requests
Building and publishing to Test PyPI on alpha releases
Building and publishing to Cargo and PyPI on new releases

To install a pre-release from Test PyPI, use (replace the version as needed):

pip install --no-cache-dir --verbose -i https://test.pypi.org/simple/ transportations-library==<version>

Versioning follows Semantic Versioning.

Also, you can find the latest alpha releases on Test PyPI.

Citation

If you use transportations-library or CrossTraffic in your research, please cite it as follows:

@software{tamaru2025tralib,
  title = {Transportations Library: Transportation knowledge management platform},
  author = {Tamaru, Rei},
  year = {2025},
  url = {https://github.com/crosstraffic/transportations-library},
  doi = {10.5281/zenodo.17295792},
}

You can also use the DOI to cite a specific version:

Alternatively, you can find the citation information in the CITATION.cff file in this repository, which follows the Citation File Format standard.

Note: This library implements established transportation engineering methodologies for educational and professional use. Users should verify results and apply appropriate engineering judgment for real-world applications.

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