# Testing Scenario Library Generation for Connected and Automated Vehicles, Part II: Case Studies

## TL;DR

This paper demonstrates how to generate testing scenario libraries for connected and automated vehicles using case studies, enhancing efficiency with reinforcement learning while maintaining accuracy.

## Contribution

It provides practical implementation guidelines and improves the methodology for high-dimensional scenario generation using reinforcement learning techniques.

## Key findings

- Accelerates CAV evaluation by multiple magnitudes
- Maintains evaluation accuracy comparable to on-road tests
- Provides detailed case studies for practical application

## Abstract

Testing scenario library generation (TSLG) is a critical step for the development and deployment of connected and automated vehicles (CAVs). In Part I of this study, a general methodology for TSLG is proposed, and theoretical properties are investigated regarding the accuracy and efficiency of CAV evaluation. This paper aims to provide implementation examples and guidelines, and to enhance the proposed methodology under high-dimensional scenarios. Three typical cases, including cut-in, highway-exit, and car-following, are designed and studied in this paper. For each case, the process of library generation and CAV evaluation is elaborated. To address the challenges brought by high dimensions, the proposed methodology is further enhanced by reinforcement learning technique. For all three cases, results show that the proposed methods can accelerate the CAV evaluation process by multiple magnitudes with same evaluation accuracy, if compared with the on-road test method.