---
title: "GM1 ADR-DSN.L.520 General – Colour and conspicuity — Certification Specifications and Guidance Material for Aerodrome Design (CS-ADR-DSN) — Issue 7, Aerodromes · Avioverse"
description: "Where there is insufficient contrast between the marking and the pavement surface, the marking should include an appropriate border."
url: "https://avioverse.aero/regulations/easa/aerodromes/cs-adr-dsn/chapter-l-visual-aids-for-navigation-markings/gm1-adr-dsn-l-520"
---

# GM1 ADR-DSN.L.520 General – Colour and conspicuity

Certification Specifications and Guidance Material for Aerodrome Design (CS-ADR-DSN) — Issue 7 · Regulation (EU) No 139/2014 · EAR revision 13 Mar 2026

GM Guidance material

## GM1 ADR-DSN.L.520 General – Colour and conspicuity

(a) Where there is insufficient contrast between the [marking](https://avioverse.aero/glossary/easa/marking) and the pavement surface, the marking should include an appropriate border.

(1) This border should be white or black;

(2) It is preferable that the risk of uneven friction characteristics on markings be reduced in so far as practicable by the use of a suitable kind of paint; and

(3) Markings should consist of solid areas or a series of longitudinal stripes providing an effect equivalent to the solid areas.

(4) Guidance on reflective materials is given in the ICAO Doc 9157, [Aerodrome](https://avioverse.aero/glossary/easa/aerodrome) Design Manual, Part 4, [Visual Aids](https://avioverse.aero/glossary/easa/visual-aids).

(b) At aerodromes where operations take place at night, pavement markings should be made with reflective materials designed to enhance the visibility of the markings.

\[Issue: ADR-DSN/3]

GM · GM1 ADR-DSN.L.520 — Regulation (EU) No 139/2014 · ED Decision 2016/027/R · Aerodromes Easy Access Rules · EAR revision 13 Mar 2026

[All rules in CHAPTER L — VISUAL AIDS FOR NAVIGATION (MARKINGS)](https://avioverse.aero/regulations/easa/aerodromes/cs-adr-dsn/chapter-l-visual-aids-for-navigation-markings)

Consolidated from the EASA Easy Access Rules (revision 13 Mar 2026, extracted 13 Oct 2026) for convenience. Not the official publication — verify against the Official Journal of the European Union and the EASA publications before operational use.