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Between Perth and Inverness, the road has been dubbed Killer A9, because of accidents and fatalities where dual-carriageway sections merge into single-carriageway - the principal cause being motorists driving at excessive speeds to overtake lines of slower-moving vehicles before the dual carriageway ends. Dangerous overtaking manoeuvres on the long single-carriageway stretches of the road are also common causes of accidents, as are the non-grade separated junctions along the northern sections, where drivers make a right turn across the opposing traffic flow. - from Wikipedia