Often people falsely believe that a turn signal is all a driver needs to turn in front of a cyclist riding in a bike lane, and that it's the cyclists fault when they "fail to yield." This is inherently false both by Oregon State Law below, the ODOT Oregon Bicycling Manual, and drivers are instructed not to do so by the Oregon DMV Driver Manual (page 30, turns)
(1) A person commits the offense of failure of a motor vehicle operator to yield to a rider on a bicycle lane if the person is operating a motor vehicle and the person does not yield the right of way to a person operating a bicycle, electric assisted bicycle, electric personal assistive mobility device, moped, motor assisted scooter or motorized wheelchair upon a bicycle lane.
There are no laws that create an exemption for cars that wish to turn, or for cyclists to yield to turning or cars that wish to turn. While ORS 811.440 gives motor vehicles the right to drive through a bike lane when making a turn, they are still required by ORS 811.050(above) to yield to riders in the bicycle lane.
Another counter-argument is that it'd be impeding traffic for the driver to stop and wait for the cyclist, however ORS 811.130(below) Impeding traffic subsection (2)(3)(a) states that: