%%EOF 04 For roadways having a posted or statutory speed limit of 45 mph or greater, the transition taper length for a lane-reduction transition should be computed by the formula L = WS. On two-way, two- or three-lane roadways where center line markings are installed, no-passing zones shall be established at vertical and horizontal curves and other locations where an engineering study indicates that passing must be prohibited because of inadequate sight distances or other special conditions. If speed hump markings are used, they shall be a series of white markings placed on a speed hump to identify its location. 05 Edge line markings may be excluded, based on engineering judgment, for reasons such as if the traveled way edges are delineated by curbs, parking, or other markings. Dotted edge line extensions may be placed through intersections or major driveways. 08 Non-retroreflective raised pavement markers should not be used alone, without supplemental retroreflective or internally illuminated markers, as a substitute for other types of pavement markings. IDOT Driveway Permits 21 Alleys 23 On-Street Parking and Loading Areas 23 . A normal line may be used to extend a wide line through an intersection. 10 Pavement markings at lane-reduction transitions supplement the standard signs. Earthwork, Landscaping, and Erosion Control. Standard: These details will be updated on a continuous basis. 25 Where through lanes approaching an intersection become mandatory turn lanes, lane-use arrow markings (see Figure 3B-24) shall be used and shall be accompanied by standard signs. Lane-reduction transition markings are not used for lane drops. 09 Directional configurations should be used to maximize correct information and to minimize confusing information provided to the road user. Stop lines should be used to indicate the point behind which vehicles are required to stop in compliance with a traffic control signal. 01 Speed reduction markings (see Figure 3B-28) are transverse markings that are placed on the roadway within a lane (along both edges of the lane) in a pattern of progressively reduced spacing to give drivers the impression that their speed is increasing. 05 Raised pavement markers should not substitute for right-hand edge line markings unless an engineering study or engineering judgment indicates the benefits of enhanced delineation of a curve or other location would outweigh possible impacts on bicycles using the shoulder, and the spacing of raised pavement markers on the right-hand edge line is close enough to avoid misinterpretation as a broken line during wet night conditions. Since yellow and white curb markings are frequently used for curb delineation and visibility, it is advisable to establish parking regulations through the installation of standard signs (see, Where curbs are marked for delineation or visibility purposes, the colors shall comply with the general principles of markings (see. 08 Stop lines should be 12 to 24 inches wide. 620.2 Pavement and Curb Markings (MUTCD Chapter 3B) 09 Retroreflective solid white markings should be used when traffic is permitted to pass on either side of the island. 0000080485 00000 n Support: Support: A through lane that becomes a mandatory exit or turn lane, An auxiliary lane 2 miles or less in length between an entrance ramp and an exit ramp, or. 18 Detectable warning surfaces mark boundaries between pedestrian and vehicular ways where there is no raised curb. These markings and signs should be placed well in advance of the turn and should be repeated as necessary to prevent entrapment and to help the road user select the appropriate lane in advance of reaching a queue of waiting vehicles (see Drawing A of Figure 3B-11). 0 08 Crosswalk lines should not be used indiscriminately. Standard: Navigate to District Specific Standards to view specific drawings that pertain to IDOT districts. . NOT FINDING WHAT YOU NEED? On freeways and expressways, the spacing may be increased to 3N for relatively straight and level roadway segments where engineering judgment indicates that such spacing will provide adequate delineation under wet night conditions.
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