Abstract

This concept paper proposes a roadmap for integrating road curvature estimation models into open mobility data standards such as Telemachus.
Building upon recent curvature-aware simulation results (P008, P009), the goal is to define consistent metadata, validation metrics, and interoperability rules for the representation of road curvature in datasets and APIs.

1. Motivation

Curvature estimation underpins safety, energy optimization, and digital mapping.
However, current open standards (e.g., OSM, SENSORIS) lack consistent definitions for curvature, radius, or grade uncertainty.
Telemachus provides a unique opportunity to formalize these as semantic fields linked to real and simulated telemetry.

2. Methodological Basis

The integration relies on three building blocks:

• Empirical curvature models from literature (ACME 2016, IFAC 2023, RoadRisk 2020);
• Simulation contracts from RS3 curvature pipelines (P009);
• Validation metadata through curvature_radius, curvature_sign, and curvature_confidence fields in Telemachus schema.

3. Proposed Standardization

We propose to introduce a Road Geometry Extension in Telemachus v1.1:

• geometry_curvature_radius (m)
• geometry_curvature_sign (+1 left / −1 right)
• geometry_grade_angle (°)
• geometry_confidence (0–1)
• source_geometry (enum: [simulated, sensor, map])

These fields will enable standard interoperability across simulation, telemetry, and map fusion systems.

4. Implementation Path

1. Prototype schema in telemachus-spec/rfcs/RFC-0015-RoadGeometry.md;
2. Validate with RS3 simulated datasets;
3. Publish open dataset (Telemachus Curvature Benchmark v1.0);
4. Draft a white paper (IEEE IV 2026 / ITS World Congress).

5. Expected Impact

• Harmonized representation of curvature across sensors and maps.
• Reusable open datasets for risk, energy, and comfort analysis.
• Enhanced reproducibility and safety research collaboration.

References

• Drosescu A. et al. (2016) Road Curvature Measurement Using IMU/GPS.
• IFAC World Congress (2023), Visual–Inertial Road Curvature Estimation.
• Road Geometry Risk Estimation Model (2020).
• Telemachus Specification (2025), Open Mobility Data Standard.
• RoadSimulator3 (2025), Curvature Simulation Framework.