If I'm on my bike, I'll offer whatever assistance I can, be it the use of tools, cel phone, or a bottle of water. If I'm in the truck, I'll offer whatever assistance is needed, up to and including a free ride home. Plenty of people (complete strangers, usually) have done the same for me.
-DR
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'08 Bianchi San Jose
'06 Giant OCR C3
'04 Specialized Hardrock Comp