Design Guidance for Channelized Right-Turn Lanes (2014) / Chapter Skim
Currently Skimming:
Pages 30-42
The Chapter Skim interface presents what we've algorithmically identified as the most significant single chunk of text within every page in the chapter.
Select key terms on the right to highlight them within pages of the chapter.
From page 30... ...
Chapter 3. Pedestrian Behavior at Channelized Right-Turn Lanes This chapter presents the results from studies of pedestrian behavior at channelized rightturn lanes conducted as part of the research, including observational field studies of pedestrian crossing behavior and interviews with orientation and mobility (O&M)
|
From page 31... ...
channelized right-turn lanes to document pedestrian and vehicle behaviors and interactions. To address the concern of pedestrians with vision impairment at channelized right-turn lanes, interviews with orientation and mobility specialists were conducted.
|
From page 32... ...
Figure 11. Observational Field Study Locations Figure 12.
|
From page 33... ...
Figure 13. Data Collection Field Setup for an Intersection in San Francisco, California A minimum of 8 hours of video was recorded at each site.
|
From page 34... ...
3.1.3 Site Characteristics The site characteristics of the observational field study sites are summarized as follows: Number of sites Area type Residential 4 Commercial 28 Industrial 3 Intersection traffic control Signalized 35 Unsignalized 0 Island type Painted 0 Raised 35 Island size Small 9 Medium 20 Large 6 Deceleration lane Yes 21 No 14 Acceleration lane Yes 7 No 28 Crosswalk location Upstream 6 Middle 25 Downstream 4 Traffic control for CRT Yield 19 Stop 2 Signal 5 None (free) 9 3.1.4 Vehicle and Pedestrian Counts Table 7 presents the vehicle and pedestrian counts that were obtained during the evening peak period (5:00 p.m.
|
From page 35... ...
Table 7. Vehicle and Pedestrian Counts During Evening Peak Period (5:00 p.m.
|
From page 36... ...
Table 7. Vehicle and Pedestrian Counts During Evening Peak Period (5:00 p.m.
|
From page 37... ...
Avoidance Maneuvers The types of avoidance maneuvers that were documented include: • Pedestrian hesitates, stops, or retreats in crosswalk due to presence of vehicle • Motorist swerves or abruptly stops to avoid pedestrian Results of the observational field studies suggest that avoidance maneuvers are relatively rare. Approximately 17 percent of the over 2,800 pedestrian crossings occurred with a motor vehicle present in the channelized right-turn lane; and out of those, only 12 pedestrian and 10 vehicle avoidance maneuvers were observed.
|
From page 38... ...
When pedestrians were waiting at the curb, a yield rate of approximately 41 percent was observed. Some of the data points included both a pedestrian in the crosswalk as well a pedestrian at the curb at the same time, which could have confounded the observed yield rate.
|
From page 39... ...
Table 8. Comparison of Pedestrian and Motorist Behavior Between Boulder, Colorado, Sites and Other Sites Pedestrian or motorist behavior Percent of total observations Boulder, CO, sites All other sites Pedestrians use entire crosswalk 86 72 Vehicles yield to pedestrians waiting at curb 47 40 Vehicles yield to pedestrians in crosswalk 99 96 Vehicles block crosswalk when stopped 4 7 Interviews with Orientation and Mobility Specialists 3.2 Interviews with ten orientation and mobility (O&M)
|
From page 40... ...
virtually uncrossable for their clients/students, because of the speed of vehicles and lack of yielding by drivers. The interview participants' opinions about crosswalk location (upstream, center, or downstream)
|
From page 41... ...
lanes with acceleration lanes are very difficult for pedestrians with vision impairment to cross due to higher vehicle speeds and lower yield rates by motorists. 3.2.2 Relevant Findings from NCHRP Project 3-78A As part of NCHRP Project 3-78A, Crossing Solutions at Roundabouts and Channelized Right Turn Lanes for Pedestrians with Vision Disabilities (20)
|
From page 42... ...
avoid pedestrian) appear to be relatively rare and were made in less than one percent of all observations.
|
Key Terms
This material may be derived from roughly machine-read images, and so is provided only to facilitate research.
More
information on Chapter Skim is available.