Effects on Driver Speeds of In-Lane Rumble Strips on Approaches to ...

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For all T-intersections, the subject approach was on the stem of the T. All of the subject approaches were two-lane roads. Two patterns were used for the rumble strips: parallel and staggered. An example of parallel rumble strips is shown in Figure 3a, and staggered rumble strips are shown in Figure 3b. a. Parallel rumble strips b. Staggered rumble strips Figure 3. Examples of Rumble Strip Applications.
Before data were collected when the researchers were notified of the planned installations, and after data were collected approximately 30 days or more after the rumble strip installation. The data collection effort included obtaining both the characteristics of the site and the speed data of vehicles at the site. Site Characteristics The site characteristic data collected at each study site are listed in Table 6. Data focused on characteristics of the study approach between the stop line and the set of rumble strips located farthest upstream. General information • Date • City/county • Time of day • Route of subject approach • Data collector’s initials • Weather • Intersecting route Intersection approach information • Approach grade • Terrain • Sight distance • Number of vertical and horizontal curves within 1 mile (1.6 km) of stop line • Direction of travel on approach • Lane width in approach and opposite directions Traffic control devices • Presence of traffic signal, beacon, or stop sign • Posted speed limit • Presence and value of advisory speeds • Type of centerline and edgeline markings • Distance from “stop ahead/signal ahead” sign to stop line • Distance from nearest rumble strip to stop line Speed Data Collection Table 6. Site Characteristics Data Collected. Field observations • Roadside environment (within 2 ft [0.6 m] and 10 ft [3.0 m] of edge of roadway for approach and opposite directions) • Roadside development • Number of access points within 1 mile (1.6 km) of stop line • Shoulder width and type in each direction • Total pavement width, pavement type and pavement condition in each direction • Presence and width of median Miscellaneous checklist • Shoot drive-through video • Take pictures • Draw typical cross-section • Draw diagram of intersection • Other notes on sight distance restrictions, unusual features, or unique characteristics Rumble strip spacing on subject approach • Distance from stop line to leading edge of first rumble strip • Parallel length of rumble strips • Distance between rumble strips • Offset between edgeline and rumble strips • Transverse width of rumble strips • Offset between rumble strips and centerline • Width of motorcycle path (distance between left and right rumble strips) • Offset between left and right rumble strips • Distance between sets of rumble strips A laser gun connected to a laptop computer recorded speeds profiles of subject vehicles as they traveled the approach from upstream of the rumble strips to the Stop sign. Only free-flowing vehicles were measured. Vehicles that turned or exhibited any unusual behavior were not used. Data were only collected on weekdays during daylight hours, generally between 8:00 am and 5:00 pm. The goal was to collect speed profiles for 125 vehicles on each study approach, with a
Page 1 and 2: Effects on Driver
Page 3 and 4: distance of the 85 th speed percent
Page 5 and 6: Deceleration Behavior The 1993 synt
Page 7: motorists to proceed through a Stop
Page 11 and 12: DISCUSSION OF RESULTS Site-by-Site
Page 13 and 14: Distance from Rumble Strip (ft)* Nu
Page 15: Authors’ Information: Marcus A. B

Effects on Driver Speeds of In-Lane Rumble Strips on Approaches to ...

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