PART IV: Summary of Comments - SCOR/RAC

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PART IV: Summary of Comments17-May-10Reviewer Comments Distribution of Ratings■ [Rating: 3] Study needs to acknowledge the objective of optimizing progression across a network (or across multipleintersecting arterials) and avoid simplified analysis that analyzes an individual arterial in isolation. The potential forinduced demand needs to be acknowledged in estimates of travel time savings and emissions reductions. Finally, thestudy needs to recognize increased fleet hybridization for emissions modeling purposes.Research Advisory Committee■ This is an interesting project and could pose some long term findings that may help down the road. It's hard to read andneeds some rewrite.■ The information provided from this research will assist state DOT's and local jurisdictions in coordinating signals incorridors to reduce emissions. The research would also offer an understanding of the potential emissions reductions fromimplementing signal timing efforts. This could contribute to the development of greenhouse gas reduction plans withrealistic expectations. As stricter emission standards are established information on other pollutants may also beimportant.■ This proposal is timely and appropriate given the continuing struggle with vehicular emissions in mostly urban andsuburban areas. A field test is strongly encouraged to either support or confirm previous work in this field.■ can this include rolling resistance? IRI■ Agree with the comment from John Davies on the need to model induced travel.Other■ [Rating: 3] After review the Committee concluded that the study is more narrowly focused than the title suggests.Additionally, we are concerned that the study is potentially duplicative or work currently under way through theDepartment of Energy. The private sector is also conducting a lot of research in this area.Item #77:C-20Development of Design Standards and Guidance forSeparated Bikeways Adjacent to Roadways(17)(46)NR 0 1 2 3 4 5SCOR 2 2 4 5 3 1RAC 3 4 12 18 9 3Standing Committee on Research■ Pedestrian use should also be considered. Funding seems appropriate. This would certainly be useful to VDOT.■ Suggest a synthesis.■ The most pressing issue appears to be path intersections with public streets. Some path designs could encourage pathusers to violate laws governing bicycle operation at the entrance and exit of the path. If the research produced guidancefor intersection designs that encourage legal and convenient bicycling between paths and streets, it would be successful.■ of possible interest to rail to help with Trespasser issues■ Insufficient funding for scope. Problem statement contains implicit assumption that proposed treatments will be effective.High likelihood that final report will not provide objective guidance due to political and advocacy influences.■ [Rating: 3] The proposed problem appears to be appropriate for the NCHRP. The potential payoff from research isestimated to be medium. There is existing research available on separated bikeway and shared used paths.Research Advisory Committee■ Very useful information to have. These are being built everywhere with little guidance. However, this proposal seems tobe scattered. At first, thought they are focusing on seperated bikeways but then they include research on bike lane designelements. Too broad to reach any usable conclusions/solutions.■ No duration of the study.IV-54
PART IV: Summary of Comments17-May-10Reviewer Comments Distribution of Ratings■ Not a well written proposal. Side paths are important and design guidance is needed but the proposal seems to addressmany issues relevant to motorized transportation. Question whether sufficient data is available to analyze bicyclecrashes, and human factors.■ Conduct synthesis first as reviewer suggests■ Separated bikeway design criteria could pose substantial challenges to the designer with regard to ROW width, sightdistance, pedestrian movements & operational issues; aesthetic implications, while secondary, would also be of concern.(Design)■ Consider a limited scope synthesis project?■ As designers start to think about “TOD” or Transit Oriented Design and going green. More research is needed on thedesign options for separated cyclist lanes. Mixed use paths address the various kinds of commuter from walker, jogger,and cyclist. However as congestion increases the need too separate pedestrians from faster moving cyclist are needed.There is a need to investigate successful European separated bikeway use and safety, then incorporating this into designguidance for North America.■ With the ever increasing use of shared use paths adjacent to roadways, this research could be beneficial.Other■ [Rating: 4]Item #78:C-09Study of Vehicle Paths on Horizontal Transition Curves(17)(46)NR 0 1 2 3 4 5SCOR 1 3 4 5 3 1RAC 1 2 8 10 15 9 4Standing Committee on Research■ This is interesting theoretical work that fills some gaps where there is little research behind Green Book standards. Thisis related to 2011-G-08, so if both are ranked highly, they will need to be coordinated. Interesting but not a high priority■ The AASHTO Technical Committee on Geometric Design, strongly supports conducting this research and believes thatthe urgency for and potential payoff from this research is high because it supports the AASHTO Strategic HighwaySafety Plan for reducing truck-related crashes.■ We are very comfortable with our current practice of using spirals. This seems like a research project to come up with analternate for spirals when spirals normally work for us.■ Combine with G-08.■ [Rating: 3] This proposal is phase one of a two-phase effort to clarify the importance of transition curves and determineneeds related to the design policy. This research can also help to justify and guide future work to reduce truck-relatedcrashes at transition curves and provide needed design guidance in a future edition of AASHTO design policy.Research Advisory Committee■ High Priority Needed for Green Book and Practioners nationwide.■ Well presented discussion and objectives. This is of national interest.■ Related to G-8.■ The Policy on Geometric Design of Highways and Streets does not provide sufficient guidance for designingimprovements to existing potentially dangerous transitional horizontal curves. The researchers suggest studying thesignificant amount of existing research in the study area to produce valuable guidelines along with crash data to beeventually included in the Green Book, leading to a reduction in truck rollover crashes out of a transition.IV-55
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PART IV: Summary of Comments - SCOR/RAC

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