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Spatial Reasoning About Motorway Traffic Safety with Isabelle/HOL

Research output: Contribution in Book/Report/Proceedings - With ISBN/ISSNChapter (peer-reviewed)peer-review

Publication date20/09/2017
Host publicationIntegrated Formal Methods: 13th International Conference, IFM 2017, Turin, Italy, September 20-22, 2017, Proceedings
EditorsNadia Polikarpova, Steve Schneider
Place of PublicationCham
Number of pages16
ISBN (Electronic)9783319668451
ISBN (Print)9783319668444
<mark>Original language</mark>English

Publication series

NameLecture Notes in Computer Science
ISSN (Print)0302-9743
ISSN (Electronic)1611-3349


Formal verification of autonomous vehicles on motorways is a challenging problem, due to the complex interactions between dynamical behaviours and controller choices of the vehicles. In previous work, we showed how an abstraction of motorway traffic, with an emphasis on spatial properties, can be beneficial. In this paper, we present a semantic embedding of a spatio-temporal multi-modal logic, specifically defined to reason about motorway traffic, into Isabelle/HOL. The semantic model is an abstraction of a motorway, emphasising local spatial properties, and parameterised by the types of sensors deployed in the vehicles. We use the logic to define controller constraints to ensure safety, i.e., the absence of collisions on the motorway. After proving safety with a restrictive definition of sensors, we relax these assumptions and show how to amend the controller constraints to still guarantee safety.