Update 4 December 2018 thank you to his Grace der Graf von Luxemburg for additionally pointing out pending case C-16/18 Dobersberger dealing with workers employed on international trains which also travel through the host Member State – Update January 2020 the Court held 19 December 2019 after Opinion Szpunar AG in July 2019. – and see scholarly review of similar Dutch cases here.
Thank you MPI’s Veerle Van Den Eeckhout for pointing out a highly relevant reference to the CJEU by the Dutch Supreme Court /Hoge Raad. The link between the posted workers Directive and conflict of laws is clear, as I have also explained here. The most interesting part of the reference for conflicts lawyers, are the questions relating to ‘cabotage’, particularly where a driver carries out work in a country where (s)he is not habitually employed (international trade lawyers will recognise the issue from i.a. NAFTA). Update January 2019 the reference is now here, the case is C-815/18.
One to keep an eye on.
(Handbook of) EU Private International Law, 2nd ed 2016, Chapter 3, Heading 3.2.5.