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I just googled for a while and could not find anything to support this.
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There's this (in Mexico):
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Learn local driving signals.
In Mexico, a blinking left turn signal on the vehicle in front of you could mean that it is clear ahead and you may pass, or it could mean the driver is making a left turn. An outstretched left arm may mean an invitation for you to pass. When in doubt, do not pass.
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http://travel.state.gov/travel/tips/...onal_1174.html