Yes. In the public health course I took last semester, road traffic accidents were the most common form of death by injury, if I remember correctly. Turns out, tobacco use is the leading cause of preventable death worldwide, a label applied to diseases that can be avoided through the use of vaccination or healthy behavior.
"Preventable" has a fairly specific meaning in the public health community, as opposed to its common-use dictionary definition. Obviously, the latter isn't very useful since most ailments are "preventable" if you think broadly enough.
It appears that the leading cause of death for folks under the age of 35 is auto accidents (the bulk of 'unintentional injuries' if I understand the data correctly).
1) Coronary heart disease - 12.2%
2) Stroke and other cerebrovascular diseases - 9.7%
3) Lower respiratory infections - 7.1%
4) Chronic obstructive pulmonary disease - 5.1%
5) Diarrhoeal diseases - 3.7%
6) HIV/AIDS - 3.5%
7) Tuberculosis - 2.5%
8) Trachea, bronchus, lung cancers - 2.3%
9) Road traffic accidents - 2.2%
Although maybe it's more correct to say the leading cause of accidental death is car crashes. I guess 'preventable' is too broad a word.