Which one of the following is true about Washington's speed limits?

You must always obey the speed limits. You cannot exceed the posted maximum, but you must exceed the posted minimum. Note that you are required to drive at a slower speed when conditions are hazardous. You should also try to keep up with the lawful flow of traffic. Two vehicles cannot collide while they are driving at the same speed in the same direction. Driving faster or slower than traffic is unsafe. [Adjusting to Traffic, Safe Driving Tips, Washington Driver Guide], [Speed Limit Signs, Traffic Signs, Rules of the Road, Washington Driver Guide]