The SHOULDER WORK sign may be used for work adjacent to the shoulder. The ROAD WORK AHEAD sign may be replaced with other appropriate signs such as the SHOULDER WORK sign.If the work space is in the median of a divided highway, an advance warning sign should also be placed on the left side of the directional roadway.Notes for Figure 6H-1-Typical Application 1 S = posted speed limit, or off-peak 85th-percentile speed prior to work starting, or the anticipated operating speed in mphĠ7 Most of the typical applications show TTC devices for only one direction.Meaning of Letter Codes on Typical Application Diagrams Meaning of Symbols on Typical Application DiagramsĬhangeable message sign or support trailer Work in the Vicinity of a Grade Crossing (see Section 6G.18) Temporary Reversible Lane Using Movable Barriers Work Within the Traveled Way of a Freeway or Expressway (see Section 6G.14) Lane Closure with a Temporary Traffic Barrier Stationary Lane Closure on a Divided Highway Half Road Closure on a Multi-Lane, High-Speed Highway Lane Closure on a Street with Uneven Directional Volumes Interior Lane Closure on a Multi-Lane Street Work Within the Traveled Way of a Multi-Lane, Non-Access Controlled Highway (see Section 6G.12) Multiple Lane Closures at an IntersectionĬrosswalk Closures and Pedestrian Detours Half Road Closure on the Far Side of an Intersection Left-Hand Lane Closure on the Far Side of an Intersection Right-Hand Lane Closure on the Far Side of an Intersection Lane Closure on the Near Side of an Intersection Work Within the Traveled Way at an Intersection and on Sidewalks (see Section 6G.13) Work Within the Traveled Way of an Urban Street (see Section 6G.11) Surveying Along the Center Line of a Road with Low Traffic Volumes Work in the Center of a Road with Low Traffic Volumes Lane Closure on a Two-Lane Road Using Traffic Control Signals Lane Closure on a Two-Lane Road with Low Traffic Volumes Lane Closure on a Two-Lane Road Using Flaggers Work Within the Traveled Way of a Two-Lane Highway (see Section 6G.10) Short Duration or Mobile Operation on a Shoulder Work on the Shoulder (see Sections 6G.07 and 6G.08) Work Outside of the Shoulder (see Section 6G.06) The formulas for determining taper lengths are provided in Table 6H-4. In many of the typical applications, sign spacings and other dimensions are indicated by letters using the criteria provided in Table 6H-3. The legend for the symbols used in the typical applications is provided in Table 6H-2. Typical applications are shown on the right-hand page with notes on the facing page to the left. Also, Table 6H-3 is used for the determination of sign spacing and other dimensions for various area and roadway types.Ġ6 Table 6H-1 is an index of the 46 typical applications. Fewer devices may be used based on field conditions.Ġ5 Figures and tables found throughout Part 6 provide information for the development of TTC plans. Except for the notes (which are clearly classified using headings as being Standard, Guidance, Option, or Support), the information presented in the typical applications can generally be regarded as Guidance.Ġ4 Other devices may be added to supplement the devices and device spacing may be adjusted to provide additional reaction time or delineation. For convenience in using the typical application diagrams, Tables 6C-1 and 6C-4 are reproduced in this Chapter as Tables 6H-3 and 6H-4, respectively.Ġ2 Procedures for establishing TTC zones vary with such conditions as road configuration, location of the work, work activity, duration of work, road user volumes, road vehicle mix (buses, trucks, cars, motorcycles, and bicycles), and road user speeds.Ġ3 In general, the procedures illustrated represent minimum solutions for the situations depicted. These treatments are found in two different typical applications, while a third typical application shows how to handle pedestrian crosswalk closures. For example, work at an intersection might present a near-side work zone for one street and a far-side work zone for the other street. In many instances, an appropriate TTC plan is achieved by combining features from various typical applications. While not every situation is addressed, the information illustrated can generally be adapted to a broad range of conditions. This Chapter presents typical applications for a variety of situations commonly encountered. Typical Applications Section 6H.01 Typical ApplicationsĠ1 Chapter 6G contains discussions of typical TTC activities. Back to Current Edition | Back to Part 6 Table of Contents 2009 Edition Chapter 6H.
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