Table of Contents - F.749.20 (04/2026) - Requirements for a head-up display interface for intelligent vehicles

1	Scope
2	References
3	Definitions
	3.1	Terms defined elsewhere
	3.2	Terms defined in this Recommendation
4	Abbreviations and acronyms
5	Conventions
6	Background on enhancement of intelligent vehicle by HUD
7	General requirements for the head-up display
	7.1	Information clarity
	7.2	Adjustability
	7.3	Quantity of information
	7.4	Adaptation to road and light variability
8	Requirements for head-up display information types
9	Requirements for head-up display information priority
	9.1	Essential priority information
	9.2	Primary and recommended priority information
	9.3	Supplementary and peripheral priority information
	9.4	Information presentation and priority
	9.5	Priority of information in different scenarios
10	Requirements of head-up display information formats
	10.1	Text information
	10.2	Icons and symbols
	10.3	Images and charts
	10.4	Digital display
	10.5	Information layout
	10.6	Augmented reality elements
11	Requirements for head-up display information colour
	11.1	Colour stability and visibility
	11.2	Rendering styles
12	Requirements of head-up display information sizes
	12.1	Readability
	12.2	Distinctiveness
	12.3	Visual perception adaptation
	12.4	Adjustability
13	Requirements for head-up display information positions and ranges
	13.1	Projection position
	Page
	13.2	Virtual image distance and display depth
Appendix I – Colour choices for head-up display
Appendix II – Explanation of element size calculation formula
Bibliography