Minimum service laws require transport operators and unions to keep a baseline level of trains, buses, ferries, or flights running during a lawful public transport strike so commuters can still reach work, schools, and hospitals. Depending on the country, that baseline is set either as a fixed legal fraction, a protected rush-hour window negotiated with unions, or a specific route percentage ordered by a transport ministry before each walkout. Workers assigned to cover those guaranteed services are legally required to report for duty and can face disciplinary action, fines, or loss of strike protection if they walk out.
Why does international law allow minimum service rules on public transport?
Under international labor standards, your right to strike is protected, though it is not absolute. The International Labour Organization (ILO) draws a strict line between services where an interruption endangers life, personal safety, or health (such as hospital emergency rooms or air traffic control) and everyday economic sectors. Passenger railways, urban buses, and commercial airlines do not meet that strict life-or-death threshold on their own.
Even so, the ILO Committee on Freedom of Association recognizes three situations where governments can legally require a minimum service during a strike. First, authorities can restrict walkouts in strict essential services affecting life, safety, or health. Second, they can intervene when a strike’s duration and geographic reach would trigger an acute national crisis endangering normal living conditions. Third, they can mandate minimum coverage in public services of fundamental importance, a category that explicitly includes passenger transport.
For a transport restriction to pass international scrutiny, it has to follow two principles. The required timetable must be genuinely minimal rather than an attempt to neutralize the strike’s economic impact, and employers or authorities must consult workers’ organizations when deciding how many services and staff are needed.
How are minimum service levels set for trains, buses, and flights?
Countries that regulate transport walkouts generally use one of three legal mechanisms to calculate how many vehicles or aircraft must stay in motion. A few countries write a flat fraction directly into statute, while most rely on collective bargaining or pre-strike government decrees.
According to a 2023 UK House of Commons Library comparative review of European strike frameworks, national models break down into three main approaches:
- Statutory flat fractions require a fixed share of regular operations regardless of the dispute. Both Greece and Romania mandate that restricted public services maintain at least one-third (33.3%) of normal service levels during a strike.
- Negotiated collective agreements leave the baseline up to unions and employers under the watch of an independent regulator. Under Italy’s Law No. 146/1990 (amended by Law No. 83/2000), transport unions and operators negotiate which services must run, and an independent Commission of Guarantee (Commissione di Garanzia) verifies that the agreement protects citizens’ constitutional rights to free movement, health, and education. Belgium uses a similar bipartisan committee model where social partners negotiate minimum transport coverage.
- Case-by-case government decrees allow a transport ministry or regional authority to set exact percentages ahead of each individual walkout. In Spain, where the constitution mandates the maintenance of essential community services, the Ministry of Transport issues a binding resolution before each strike that adjusts service minimums based on the strike’s duration, expected passenger demand, and whether travellers have another way to make the trip.
That route-by-route calculation produces wide gaps within a single walkout. During a Spain general strike in November 2026, the Spanish Ministry of Transport required airlines to operate 52% to 85% of flights connecting the mainland with the Balearic Islands, the Canary Islands, Ceuta, and Melilla because island and enclave residents had no practical overland option. On domestic mainland flight routes where an alternative train or bus journey took less than 5 hours, the minimum dropped to between 18% and 37%—a formula designed to relocate 40% of affected passengers—while airport security-restricted catering was set at a 30% minimum workforce.
How do transport operators schedule and staff a strike day?
Running an emergency timetable requires days of advance planning, so minimum service laws always pair service quotas with strict notice deadlines and cooling-off rules. In Italy, unions must give at least 10 days’ advance notice before a public transport strike (and 5 days’ notice to the Minister of Transportation under Law 242/1980 to maintain international connections), after which the law requires a mandatory conciliation and cooling-off window that can take up to 20 to 21 days. France’s 2007 public transport continuity law requires unions to give 5 clear days’ notice (which equals 7 calendar days in practice) and bans rotating strikes where different groups of workers walk out in staggered shifts to paralyze the network with minimal lost pay.
Once the strike date is locked in, operators rarely spread reduced services evenly across a 24-hour clock. In Italy’s urban transit and regional rail systems, collective agreements concentrate guaranteed trains and buses into fixed morning and evening commuter rush-hour bands so people can travel to work and return home, while midday service can drop to zero. Under France’s 2007 law, regional authorities and operators draw up continuity plans that prioritize specific high-need routes serving hospitals, schools, and major rail stations.
A common misconception is that a 40% or 50% minimum timetable means only 40% or 50% of the workforce has to show up. As a 2023 UK Parliament Transport Committee inquiry into passenger railways documented, running even half of a train schedule requires nearly all signallers, dispatchers, and network safety controllers to be at their desks to keep tracks open and safe. Because many European jurisdictions forbid hiring temporary agency workers to replace strikers (Belgium bans agency replacements outright, and Section 11(5) of Germany’s Temporary Employees Act fines employers up to €500,000 for using agency staff as strikebreakers), operators have to fill minimum rosters using existing staff.
To do that legally, employers or government officials issue formal work orders naming the specific employees required on shift. Under the UK’s former “Strikes (Minimum Service Levels) Act 2023”, for example, an employer had to consult the union and issue a work notice at least 7 calendar days before the strike date (modifiable up to 4 days prior) identifying only the staff reasonably necessary to run the guaranteed service, without picking workers based on whether they belonged to a union.
What happens when workers or unions defy a minimum service order?
When an employee is lawfully named on a minimum service roster or requisition order, walking out strips away the legal immunity that normally protects strikers from being fired or disciplined for breach of contract. Depending on the country, defying an order can trigger administrative fines, workplace discipline, or even criminal penalties for the individual worker, alongside heavy financial damages against a union that fails to take reasonable steps to ensure its members comply.
In Italy, if a planned transport walkout poses an imminent threat to constitutionally protected rights, the Prime Minister, a delegated Cabinet Minister, or a local Prefect (for regional transit) can issue an immediately enforceable return-to-work injunction known as a precettazione. That order can mandate higher minimum service levels or postpone the strike entirely, and unions or workers have just 7 days to appeal the injunction before an administrative tribunal. In Belgium, if unions and employers fail to reach a minimum service deal on their own, the Minister of Labour steps in to fix the required service level and can requisition essential transport personnel; refusing to comply with a requisition order carries criminal liability.
Not every country relies on statutory orders or worker requisitions. Germany and the Netherlands have no explicit statutory minimum service laws for public transport at all, relying instead on collective bargaining norms and court proportionality rulings. In France, while the 2007 transport law mandates service continuity plans and advance notice by individual strikers, authorities have not used statutory worker requisitioning in the public transport sector in practice.
The United Kingdom offers the clearest example of a country enacting and then abandoning statutory transport minimums. In July 2023, Parliament passed the “Strikes (Minimum Service Levels) Act 2023” and introduced passenger rail regulations setting a 40% service threshold on strike days. Train operators never issued a single work notice under the law, citing the operational complexity of compelling signallers to work and the risk of escalating disputes. On December 18, 2025, the UK formally repealed the entire minimum service framework when the Employment Rights Act 2025 received Royal Assent, while separately updating industrial action rules to require 10 days’ strike notice from unions starting in February 2026.