a-b-street/abstreet

Starter project: Improve traffic signal heuristics

Open

#8 opened on Nov 25, 2019

View on GitHub
 (6 comments) (0 reactions) (0 assignees)Rust (256 forks)batch import
good first issue

Repository metrics

Stars
 (6,779 stars)
PR merge metrics
 (No merged PRs in 30d)

Description

I can't find data about how Seattle traffic signals are actually timed right now. So for the moment, I'm automatically generating a policy for every intersection. There are a bunch of different policies for different types of intersections (for a 4-way, should there be 2 phases with no protected left turn or 4 phases with protected left turns?). Every phase is hardcoded to 30 seconds right now. A nice project contained to one layer of the code (just the map model) would be to improve these heuristics. For example, roads have a rank (primary > secondary > residential) from OpenStreetMap, so probably bigger roads should have longer durations.

Ex policy: https://github.com/dabreegster/abstreet/blob/573edbd13e5aa4bedba0bd819d3d7b32dba11b59/map_model/src/traffic_signals.rs#L247

Contributor guide

Research direction
Inspect the existing traffic signal policy generation code at map model/src/traffic signals.rs. Understand how phases are currently created with hardcoded 30 second durations. Use the road rank from OpenStreetMap to adjust durations accordingly for different road types.
Tech stack
rust
Domain
backend
Issue type
Feature
DifficultyEstimated implementation difficulty for a new contributor, from 1 for very small changes to 5 for expert-level work.
3
Estimated timeA rough time range for an experienced contributor to investigate, implement, test, and prepare a pull request.
1-2 days
Activity statusHow available the issue appears right now: fresh, active, stale, blocked, or waiting on maintainer input.
Active
ClarityHow clearly the issue explains the expected change, acceptance criteria, and next step.
Mostly clear
Prerequisites
RustTraffic signal concepts
Newbie friendlinessA 1-100 score estimating how approachable this issue is for first-time contributors.
60