Homelessness crisis: Couple builds tiny home along I-5 on-ramp in Seattle

Clustered along I-5 and I-90 corridors in Washington state, 2,221 homeless camps are now on WSDOT right-of-ways, according to the department's latest survey. And, long-term structures like the ones off of the Mercer St. exit in Seattle now appear in more than half of them. More permanent structures allow the risks for WSDOT to pile up: hypodermic needles are the most common danger, followed by human waste and biohazards. Workers who come to the camps have been threatened with violence and there is increased risk to motorists.