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California Temporary Traffic Control Handbook <br />Channelizing Devices <br />Channelizing devices (cones, tubular markers, channelizers (CA), portable delineators, <br />barricades, longitudinal channelizing devices, drums or vertical panels) are elements in a <br />total system of temporary traffic control for use during construction and maintenance <br />operations. These elements shall be preceded by a subsystem of warning devices, <br />adequate in size, number and placement for the type of roadway on which the work will <br />take place. See CA MUTCD Figure 6F-7 and 6F-102(CA) for channelizing devices <br />requirements (see page 23 and 24). All channelizing devices shall be crashworthy. <br />Channelizing devices can be used as follows: <br />To channel and/or divert traffic in advance of a temporary traffic control zone (work <br />zone). <br />To define traffic lanes through the work zone. <br />To define a change in the position of the lanes around a work zone. <br />On detours to define curves and the edges of the roadway. <br />To separate opposing lanes of traffic. <br />Table F — Maximum Spacing of Channelizing Devices <br />Speed (mph) <br />Taper* <br />Maximum Channelizer S <br />ftTan ent ft <br />acing <br />Conflict" ft <br />20 <br />20 <br />40 <br />10 <br />25 <br />25 <br />50 <br />12 <br />30 <br />30 <br />60 <br />15 <br />35 <br />35 <br />70 <br />17 <br />40 <br />40 <br />80 <br />20 <br />45 <br />45 <br />90 <br />22 <br />50 <br />50 <br />100 <br />25 <br />55 <br />55 <br />110 <br />27 <br />60 <br />60 <br />120 <br />30 <br />65 <br />65 <br />130 <br />32 <br />70 <br />70 <br />140 <br />35 <br />Maximum channelizer device spacing for all speeds on one-lane/two-way tapers is <br />(20 ft). Maximum channelizer device spacing for all speeds on downstream tapers is <br />(20 ft). All other tapers are as shown. <br />" Use on intermediate and short term projects for taper and tangent sections where <br />there are no pavement markings or where there is a conflict between existing <br />pavement markings and channelizers. <br />Note: A minimum 10 -ft drivable lane width should be provided where possible. <br />20 <br />