Reinforcement learning (RL) has emerged as a promising approach for motion planning challenges in autonomous driving (AD).
This survey provides a comprehensive review of RL-based motion planning, focusing on lessons learned from a driving task perspective.
It outlines the fundamentals of RL methodologies and analyzes their applications in motion planning, considering scenario-specific features and task requirements.
The survey also identifies frontier challenges and proposes strategies for overcoming unresolved issues in RL-based motion planning.