Crate macro_traffic_sim_core 

Macro Traffic Simulation Core

Implementation of the classical 4-step macroscopic traffic demand model:

1. Trip Generation - Produces trip productions/attractions per zone
2. Trip Distribution - Gravity model with Furness balancing
3. Mode Choice - Multinomial logit (AUTO, BIKE, WALK)
4. Traffic Assignment - User Equilibrium via Frank-Wolfe, MSA, or Gradient Projection

Network Format

Based on GMNS (General Modeling Network Specification) at the mesoscopic level. Turn restrictions are encoded in the graph topology: connection links exist only for allowed movements. Routing algorithms respect restrictions automatically.

Quick Start

use macro_traffic_sim_core::config::{ModelConfig, AssignmentMethodType};
use macro_traffic_sim_core::pipeline::run_four_step_model;
use macro_traffic_sim_core::trip_generation::RegressionGenerator;
use macro_traffic_sim_core::trip_distribution::ExponentialImpedance;
use macro_traffic_sim_core::mode_choice::MultinomialLogit;

// Acquire meso network (load from CSV/JSON/REST API, whatever), configure, and run

Modules

assignment

Traffic Assignment Module (Step 4)

config

Configuration

error

Error Module

gmns

GMNS Module

mode_choice

Mode Choice Module (Step 3)

od

OD Matrix Module

pipeline

Pipeline Module

trip_distribution

Trip Distribution Module (Step 2)

trip_generation

Trip Generation Module (Step 1)

verbose

Logging Module

zone

Zone

Macros

log_additional

Logs a debug-level message if the global verbose level is VerboseLevel::Additional or higher.

log_all

Logs a trace-level message if the global verbose level is VerboseLevel::All.

log_main

Logs an info-level message if the global verbose level is VerboseLevel::Main or higher.

verbose_log

Convenience macro for global verbose logging.