Rule(s) for overtaking an 'ahead' rider on dirt roads

[Kokdjembe]

I see lane splitting has been tabled for debate. For me a 'piss me off' issue is joining imprompto invited group rides and... as I find my rythm, 'zig zagging' all over to get good lines, some stranger will unexpectedly chance to dart pass me. Am I just nervous and over-thinking danger? Or are there basic courtesy rules about overtaking on dirt roads, 2-tracks and alike?

 

[BuRP]

 

[Welsh]

 

[Psycho Porra]

 

[Thump]

 

[RobCrouch]

 

[m0lt3n]

 

[RobCrouch]

 

[BuRP]

 

[RobCrouch]

 

[Vintage_Mania]

 

[Karoo Rider]

 

[J3THRO]

 

[Karoo Rider]

 

[2StrokeDan]