Since the outbreak of the Covid-19 crisis, many of the border regions face border-crossing restrictions. This has many negative effects on the cross-border life especially for frontier workers. The Commission is very concerned by these restrictions to the free movement of citizens.  Therefore, the Commission has adopted guidelines (Communication presenting “Guidelines concerning the exercise of the free movement of workers” C(2020)2051 final; The guidelines have been translated into all official languages of the EU). The main points are: (1) Restrictions introduced by Member States related to the crossing of their borders can lead to additional difficulties or even hinder efforts to fight the Covid-19 crisis; (2) The continued free movement of all workers in critical occupations is essential, including both frontier workers and posted workers. Member States should allow workers to enter the territory of the host Member State and have unhindered access to their place of work if they exercise [a critical occupation]; (3) The Commission urges Member States to establish specific burden-free and fast procedures for border crossings with a regular flow of frontier and posted workers, to ensure a smooth passage for them; and (4) Member States should allow frontier and posted workers to continue crossing their borders to their workplace if work in the sector concerned is still allowed in the host Member State.