Drugs or alcohol were a factor in the cause of a single-car collision on I-90 that sent a Redmond man to Overlake Hospital Monday night, according to the Washington State Patrol (WSP).

WSP officials say Vaibhav Vishnoi, 30, was driving east on I-90 near mile post 27 when his 2008 Toyota Corolla went off the left side of the roadway, crashed into some trees and rolled at around 10 p.m.

Investigators said they believe drugs or alcohol were involved in the collision, but the cause is still under investigation.