2009 Edition Part 3 Figure 3B-15. Examples of Applications of Markings for Obstructions in the Roadway (Sheet 2 of 2)
Figure 3B-15. Examples of Applications of Markings for Obstructions in the Roadway (Sheet 2 of 2)
This figure illustrates three examples of markings for obstructions in the roadway.
Sheet 2 of the figure shows one vertical highway, example C. Notes state "For speeds 45 mph or more, L = WS. For speeds less than 45 mph, L = WS2/60. S = posted, 85th percentile, or statutory speed in mph. W = offset distance in feet. Minimum length of L = 100 feet in urban areas and 200 feet in rural areas. Length 'L' should be extended as required by sight distance conditions."
- A legend shows a black arrow indicating the direction of travel in the lanes, an asterisk denoting "Wide solid white lane line or normal width solid double white lane line," and a black "x" inscribed in a square denoting an obstruction.
- The third example is labeled "C – Traffic passing in the same direction on both sides of an obstruction." It shows two northbound lanes with an obstruction in an island formed by south-pointing white chevrons in the center of the two lanes to the right of two southbound lanes with an obstruction in an island formed by north-pointing white chevrons in the center of the two lanes. Arrows show that the direction of travel is two lanes in each direction. A solid double yellow line separates the opposing lanes. In the northbound lanes, starting from the bottom of the figure, a broken white line separates the through lanes from each other and then changes to a solid white line as it approaches the obstruction, then it separates into two tapering solid white lines, one on each side of the obstruction. Beyond the obstruction, the two solid double white lines taper back to merge into one solid double white line at the center of the roadway. The one solid double white line then continues along the center of the road and changes to a broken single white line as it approaches the top of the illustration. Several dimensions are shown on the figure. "W" is shown as the offset from the normal center of the roadway to the outside edge of the solid white line immediately opposite the obstruction. That outside edge of the solid white line is shown as 1 to 2 ft. "L" is shown as the longitudinal distance along the roadway for the taper of the solid double white line(s) from the normal center of the roadway to the greatest width of the channelizing island at the obstruction. The dimension of the solid white line on either side of the channelizing island also is shown as "L." Asterisks are shown next to the single and double white lines on either side of the island, denoting: "wide solid white lane lines or normal width solid double white lane lines." A series of white chevron lines, running from north to south at 45-degree angles, are shown filling the parallelogram-shaped island between the two solid double white lines in the northbound lanes. In the southbound lanes, the same island configuration, lane markings, and asterisks are shown as in the northbound lanes, except the solid white line on either side of the channelizing island is shown as a solid double white line. The dimensions shown are the same as for the northbound lanes. A series of white chevron lines, running from south to north at 45-degree angles, are shown filling the island in the southbound lanes.
Back to: Sheet 1