3.6 Raised Pavement Markers 3-3 3.7 Impact Attenuator Marking 3-4. Contents WSDOT Traffic Manual M 51-02.05 Page ix April 2011 Page Chapter 4 Signals and Illumination 4-1 4.1 MUTCD 4-1 4.2 Design Manual 4-1 4.3 Flashing Operation 4-1 4.4 Intersection Control Beacons 4-1 4.5 Audio-Tone Signal Application 4-2 4.6 Illumination 4-2 Chapter 5 Work