Judgment of the Court (Sixth Chamber) of 21 November 2024.#'Еkоstroy' EOOD v Agentsia 'Patna infrastruktura'.#Request for a preliminary ruling from the Administrativen sad – Haskovo.#Reference for a preliminary ruling – Approximation of laws – Road transport – Tax provisions – Directive 1999/62/EC – Charging of heavy goods vehicles for the use of certain infrastructures – Penalties applicable to infringements of the national provisions adopted under that directive – Article 9a – Requirement of proportionality – National legislation penalising all offences by means of a flat-rate fine.#Case C-61/23.