We have neighbors and otherwise nice people who routinely don't use turn signals. I don't yell at them but I do sometimes yell at the inconsiderate dumb-assess who I wait for at intersections and then they suddenly turn; it embarrasses my kids.

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1985 380SE Blue/Blue - 230,000 miles
2012 Subaru Forester 5-speed
2005 Toyota Sienna
2004 Chrysler Sebring convertible
1999 Toyota Tacoma