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How Do You Get Drivers To Slow Their Roll?

caption: Variable speed signs on northbound Interstate 5 into Seattle.
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Variable speed signs on northbound Interstate 5 into Seattle.
Flickr Photo/Wendi Dunlap (CC-BY-NC-ND)

Marcie Sillman talks with Mark Hallenbeck about the implications of reducing speed limits in Seattle. Hallenbeck directs the Washington State Transportation Center at the University of Washington.

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