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Page 6C-4 2003 Edition <br /> Table 6C-1, Suggested Advance Warning Sign Spacing <br /> Road Type Distance Between Signs** <br /> A B C <br /> Urban (low speed)" 30 (100) 30 (100) 30 (100) <br /> Urban (high speed)* 100 (350) 100 (350) 100 (350) <br /> Rural 150 (500) 150 (500) 150 (500) <br /> Expressway/Freeway 300 (1,000) 450 (1,500) 800 (2,640) <br /> Speed category to be determined by highway agency <br /> ** Distances are shown in meters(feet).The column headings A, B, and C are the dimensions <br /> shown in Figures 6H-1 through 6H-46.The A dimension is the distance from the transition or <br /> point of restriction to the first sign.The B dimension is the distance between the first and second <br /> signs.The C dimension is the distance between the second and third signs.(The third sign is the <br /> first one in a three-sign series encountered by a driver approaching a TTC zone.) <br /> Option: <br /> Advance warning may be eliminated when the activity area is sufficiently removed from the road users'path <br /> so that it does not interfere with the normal flow. <br /> Section 6C.05 'Transition Area <br /> Support: <br /> The transition area is that section of highway where road users are redirected out of their normal path. <br /> Transition areas usually involve strategic use of tapers, which because of their importance are discussed <br /> separately in detail. <br /> Standard: <br /> When redirection of the road users'normal path is required,they shalt be channelized from the <br /> normal path to a new path. <br /> Support: <br /> In mobile operations, the transition area moves with the work space. <br /> Section 6C.06 Activity Area <br /> Support: <br /> The activity area is the section of the highway where the work activity takes place. It is comprised of the <br /> work space, the traffic space, and the buffer space. <br /> The work space is that portion of the highway closed to road users and set aside for workers,equipment, <br /> and material, and a shadow vehicle if one is used upstream. Work spaces are usually delineated for road users <br /> by channelizing devices or, to exclude vehicles and pedestrians, by temporary barriers. <br /> Option: <br /> The work space may be stationary or may move as work progresses. <br /> Guidance: <br /> Since there might be several work spaces (some even separated by several kilometers or miles) within the <br /> project limits, each work space should be adequately signed to inform road users and reduce confusion. <br /> Support: <br /> The traffic space is the portion of the highway in which road users are routed through the activity area. <br /> The buffer space is a lateral and/or longitudinal area that separates road user flow from the work space or <br /> an unsafe arca, and might provide some recovery space for an errant vehicle. <br /> Sect.6C.04 to 6C.06 <br />