Consider getting a 3-bin laundry sorter and placing it in the room where clothing is most often being removed (the bathroom?) or in a shared hallway.  Label bins: whites, colors, and darks.  Rather than tripping over piles on laundry day, simply grab one of the mesh bags and dump it into the washer.  Clean clothes can be folded and placed back in the mesh bags so they can be transported back to each person's room and put away.  It's a wonderful thing.  

Prevent delicates/hand washables from inadvertently getting thrown in the wash with the everyday laundry by hanging a bag on the side of the hamper to store them before laundry day.  See the photo below of a small mesh bag hung on the side of a hamper for stockings and knee highs that will be hand washed.