drivers training help: 4 categories of signs

[bc008]

i have to draw some signs, and i need one from each category. i have Warning, Regulatory, and Guide. what one am i missing? internet searches come up with multiple other categories

 

[d_and_n5000]

Er...is it location? It's the only one that makes total sense to me - regulatory, which states laws you must follow, warning, warning you about something, guide, giving you a heads-up about something but that isn't mandatory to follow - it followsthat location would be there too, to tell where you are.

 

[Gray-Wolf]

One web site lists 3 -

Shape and color make it possible to recognize the various kinds of highway signs at a glance. Traffic signs are divided into three types:
Regulatory Signs
Warning Signs
Guide/Informational Signs

But here in GA,

Warning
Regulatory
Service (Hospitals and so forth)
Guide (highway numbers)
And they include a separate area, Construction signs and warnings.