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Spatial Reasoning About Motorway Traffic Safety with Isabelle/HOL

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Integrated Formal Methods (IFM 2017)

Part of the book series: Lecture Notes in Computer Science ((LNPSE,volume 10510))

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Abstract

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.

This work was supported by the EPSRC Research Programme EP/N007565/1 Science of Sensor System Software (S4).

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Notes

  1. 1.

    The code of the formalisation can be found at www.github.com/svenlinker/HMLSL. It is compatible with Isabelle2016-1.

  2. 2.

    The function \( Abs\_nat\_int \) takes a set of natural numbers as its input, and returns an element of type \( nat\_int \). It is automatically created by Isabelle as a result of the type definition in Sect. 2.2. Subsequently, we will silently omit these functions.

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Linker, S. (2017). Spatial Reasoning About Motorway Traffic Safety with Isabelle/HOL. In: Polikarpova, N., Schneider, S. (eds) Integrated Formal Methods. IFM 2017. Lecture Notes in Computer Science(), vol 10510. Springer, Cham. https://doi.org/10.1007/978-3-319-66845-1_3

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  • DOI: https://doi.org/10.1007/978-3-319-66845-1_3

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