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California WTCD 2014 Edition Page 1027 (FHWA's MUTCD 2009 Edition,including Revisions 1 &2.as amended for use in California) Guidance: I 17 On State highways, Caltrans'Standard Plans for Trac Control Systems(Standard Plans T9 through T17)should be used. See Section 1A.11 for information regarding this publication. Section 6C.09 Detours and Diversions Support: o1 A detour is a temporary rerouting of road users onto an existing highway in order to avoid a TTC zone. Guidance: o2 Detours should be clearly signed over their entire length so that road users can easily use existing highways to return to the original highway. Support: 03 A diversion is a temporary rerouting of road users onto a temporary highway or alignment placed around the work area. Standard: o4 The detour route shall be evaluated for height,weight,and size restrictions.Appropriate signs shall be posted along the route to advise road users of any restrictions.Refer to CVC 21363 for detour signs. Option: o5 Advance signs or changeable message signs(CMS) may be necessary to give trucks an opportunity to turn around and retrace their path or select another route. Section 6C.10 One-Lane,Two-Way Traffic Control Standard: o1 Except as provided in Paragraph 5,when traffic in both directions must use a single lane for a limited distance, movements from each end shall be coordinated. Guidance: o,Provisions should be made for alternate one-way movement through the constricted section via methods such as flagger control, ^ �'n g trafisfee, a pilot car, traffic control signals, or stop or yield control. 03 Control points at each end should be chosen to permit easy passing of opposing lanes of vehicles. 04 If traffic on the affected one-lane roadway is not visible from one end to the other, then flagging procedures, a pilot car with a flagger used as described in Section 6C.13, or a traffic control signal should be used to control opposing traffic flows. Option: os If the work space on a low-volume street or road is short and road users from both directions are able to see the traffic approaching from the opposite direction through and beyond the worksite,the movement of traffic through a one-lane,two-way constriction may be self-regulating. Support: I o6 See Section 5A.01 and Section 6A.01 for definition of a low-volume road where paragraph 5 is applied. Section 6C.11 Flailager Method of One-Lane. Two-Way Traffic Control Guidance: 01 Except as provided in Paragraph 2, traffic should be controlled by a flagger at each end of constricted section of roadway. One of the flaggers should be designated as the coordinator. To provide coordination of the control of the traffic, the flaggers should be able to communicate with each other orally, electronically, or with manual signals. These manual signals should not be mistaken for flagging signals. Option: 02 When a one-lane,two-way TTC zone is short enough to allow a flagger to see from one end of the zone to the other,traffic may be controlled by either a single flagger or by a flagger at each end of the section. Guidance: 03 When a single flagger is used, the flagger should be stationed on the shoulder opposite the constriction or work space, or in a position where good visibility and traffic control can be maintained at all(Imes. When good visibility and traffic control cannot be maintained by one flagger station, traffic should be controlled by a flagger at each end of the section. Chapter 6C—Temporary Traffic Control Elements November 7,2014 Part 6—Temporary Traffic Control