Thierry Fraichard

About

Thierry Fraichard is a pioneering robotics researcher whose work has fundamentally shaped how autonomous systems perceive, plan, and navigate safely in dynamic environments. His research spans motion planning, trajectory planning, and — most distinctively — motion safety for robotic systems, areas in which he has made lasting theoretical and practical contributions. Fraichard is perhaps best known for introducing the concept of **Inevitable Collision States (ICS)**, first formalized in his landmark 2004 paper (322 citations), which defines states from which no future trajectory can prevent a collision. This elegant framework transformed how the robotics community thinks about safety, moving beyond reactive obstacle avoidance toward principled, forward-looking risk assessment. His follow-up work extended ICS into probabilistic settings (2010) and constrained sensing environments (2011), demonstrating the concept's enduring versatility. Earlier, his development of the **state-time space** framework for dynamic trajectory planning (1998, 121 citations) provided a powerful formalism for robots navigating among moving obstacles under dynamic constraints. His contributions to **continuous-curvature path planning** for car-like robots further bridged theoretical robotics and real-world autonomous vehicle applications. With over 1,000 cumulative citations, Fraichard's work remains essential reading for researchers pursuing safe, intelligent autonomous navigation.

Research Focus

Key Achievements

Top Papers

1. 1
   Inevitable collision states — a step towards safer robots?

   322 citations · 2004
2. 2
   A Short Paper about Motion Safety

   130 citations · 2007
3. 3
   Trajectory planning in a dynamic workspace: a 'state-time space' approach

   121 citations · 1998
4. 4
   Planning continuous-curvature paths for car-like robots

   83 citations · 2002
5. 5
   Provably safe navigation for mobile robots with limited field-of-views in dynamic environments

   81 citations · 2011
6. 6
   Dynamic trajectory planning with dynamic constraints: A 'state-time space' approach

   80 citations · 2002
7. 7
   Collision-free and continuous-curvature path planning for car-like robots

   76 citations · 2002
8. 8
   Inevitable Collision States: A probabilistic perspective

   67 citations · 2010
9. 9
   Path planning with uncertainty for car-like robots

   66 citations · 2002
10. 10
    Sensor-Based Control Architecture for a Car-Like Vehicle

    65 citations · 1999

Key Collaborators

Contact & Links