New AASHTO Design Publications 2005

1. New AASHTO Design Publications2005

4. One curve is used for friction factor for all designs instead of the three in previous editions � high-speed, low speed, and turning roadways No change in friction values or superelevation values for high-speed design Minor change in friction values and superelevation for low-speed design Committee judgment that friction factors should be consistent for both urban and rural designs Tables cover Rural Highways, Urban Freeways, and High-Speed Urban Streets New table for low speed urban streets No change in use of Method 5 and Method 2 distribution Method 2 (used for low speed urban) relies more on friction, and therefore less superelevation is needed One curve is used for friction factor for all designs instead of the three in previous editions � high-speed, low speed, and turning roadways No change in friction values or superelevation values for high-speed design Minor change in friction values and superelevation for low-speed design Committee judgment that friction factors should be consistent for both urban and rural designs Tables cover Rural Highways, Urban Freeways, and High-Speed Urban Streets New table for low speed urban streets No change in use of Method 5 and Method 2 distribution Method 2 (used for low speed urban) relies more on friction, and therefore less superelevation is needed

5. Comparison of friction factors. For low speed, since a larger friction factor is used, less superelevation is required in 2004 GB compared to 2001 GB, for the same radius curveComparison of friction factors. For low speed, since a larger friction factor is used, less superelevation is required in 2004 GB compared to 2001 GB, for the same radius curve

7. Superelevation table from 2001 Green Book Point out horizontal and vertical axis Extends to right to design speeds up to 80 mph Extends down to smaller radii Point out location of superelevation runoff [Click to get blowup] [Click to show how user could enter table to get proper superelevation value]Superelevation table from 2001 Green Book Point out horizontal and vertical axis Extends to right to design speeds up to 80 mph Extends down to smaller radii Point out location of superelevation runoff [Click to get blowup] [Click to show how user could enter table to get proper superelevation value]

8. Superelevation table from 2001 Green Book Point out horizontal and vertical axis Extends to right to design speeds up to 80 mph Extends down to smaller radii Point out absence of superelevation runoff 2001 Green Book had Radius in left column and Superelevation in body of table [Click to get blowup] [Click to show how user could enter table to get proper superelevation value] Do not interpolate, go to next lowest radius and read to the left. But have superelevation values actually changed? [Go to next slide]Superelevation table from 2001 Green Book Point out horizontal and vertical axis Extends to right to design speeds up to 80 mph Extends down to smaller radii Point out absence of superelevation runoff 2001 Green Book had Radius in left column and Superelevation in body of table [Click to get blowup] [Click to show how user could enter table to get proper superelevation value] Do not interpolate, go to next lowest radius and read to the left. But have superelevation values actually changed? [Go to next slide]

9. Diagram from 2001 Green Book for determining horizontal sight distance. Note M. [click once to superimpose same diagram from 2004 Green Book. Note HSO.] [click once to bring in HSO = Horizontal sightline offset] Simple change in terminology due to conflict with surveying term Straight swap of text in Green Book, no other changesDiagram from 2001 Green Book for determining horizontal sight distance. Note M. [click once to superimpose same diagram from 2004 Green Book. Note HSO.] [click once to bring in HSO = Horizontal sightline offset] Simple change in terminology due to conflict with surveying term Straight swap of text in Green Book, no other changes

11. All technical corrections to the 2001 GB have been fixed in the 2004 GB. For those with the 2001 GB the technical corrections are posted on the AASHTO web site. There are three Green Books in current usage, 2001 First Printing, 2001 Second Printing, 2004. The 2001 Second Printing included some, but not all, of the technical corrections.All technical corrections to the 2001 GB have been fixed in the 2004 GB. For those with the 2001 GB the technical corrections are posted on the AASHTO web site. There are three Green Books in current usage, 2001 First Printing, 2001 Second Printing, 2004. The 2001 Second Printing included some, but not all, of the technical corrections.

12. FHWA treatment of 2004 Green Book. The superelevation information in the 2004 Green Book will most likely be included in the next Green Book (2007?? 2008??)FHWA treatment of 2004 Green Book. The superelevation information in the 2004 Green Book will most likely be included in the next Green Book (2007?? 2008??)

13. Replaces 1991 Policy Will require FHWA adoption through Federal Register process. Minimum design speed for rural is 70, it used to say minimum for rolling is 60. Minimum for rolling has been dropped because impacts of construction on level and rolling are considered sufficiently close that individual criteria are not necessary. Expanded maximum grade table to include intermediate and higher design speeds. Revised shoulder width discussion for mountainous � existing reference to 6 feet has been deleted. (For mountainous: 8 foot right shoulder, 4 foot left shoulder required for 4 or 6 lanes. 8 feet required both sides for 8 lane freeway) Sloping curbs, when located at the outer edge of the paved shoulder, are limited to 4 inch height.Replaces 1991 Policy Will require FHWA adoption through Federal Register process. Minimum design speed for rural is 70, it used to say minimum for rolling is 60. Minimum for rolling has been dropped because impacts of construction on level and rolling are considered sufficiently close that individual criteria are not necessary. Expanded maximum grade table to include intermediate and higher design speeds. Revised shoulder width discussion for mountainous � existing reference to 6 feet has been deleted. (For mountainous: 8 foot right shoulder, 4 foot left shoulder required for 4 or 6 lanes. 8 feet required both sides for 8 lane freeway) Sloping curbs, when located at the outer edge of the paved shoulder, are limited to 4 inch height.

14. HOV Guide � Guide for high-occupancy vehicle facilities Replaces 1992 Guide Rewritten and expanded guidance for HOV and managed lane facilities Includes the full range of project life: Planning, design, operations, enforcement Separate chapters for freeway facilities and arterial street facilities At least four types of line-haul HOV facilities can be considered for implementation � an HOV facility in separate right-of-way, barrier separated facilities (including reversible and two-way facilities), concurrent flow lanes, or contraflow lanes. HOV Guide � Guide for high-occupancy vehicle facilities Replaces 1992 Guide Rewritten and expanded guidance for HOV and managed lane facilities Includes the full range of project life: Planning, design, operations, enforcement Separate chapters for freeway facilities and arterial street facilities At least four types of line-haul HOV facilities can be considered for implementation � an HOV facility in separate right-of-way, barrier separated facilities (including reversible and two-way facilities), concurrent flow lanes, or contraflow lanes.

15. Park-and-Ride Guide � Guide for park-and-ride facilities Replaces the 1992 guide Rewritten and expanded to cover all elements of the planning and design process Defining the type and purpose of the facility Planning � for the system and for the individual facility, use public involvement, correct location is essential Operations � must operate in a manner that promotes safety, mobility, and efficiency; includes access management, priority treatments for HOV and transit, signing, and ITS technology Design � Basic concepts presented Architecture, landscape, and art � Park and ride facilities are people places and can become more than just a place to parkPark-and-Ride Guide � Guide for park-and-ride facilities Replaces the 1992 guide Rewritten and expanded to cover all elements of the planning and design process Defining the type and purpose of the facility Planning � for the system and for the individual facility, use public involvement, correct location is essential Operations � must operate in a manner that promotes safety, mobility, and efficiency; includes access management, priority treatments for HOV and transit, signing, and ITS technology Design � Basic concepts presented Architecture, landscape, and art � Park and ride facilities are people places and can become more than just a place to park

16. Design and construction of streets and highways in public rights-of-way must consider pedestrians. Purpose is to provide guidance for accommodating pedestrians along streets and highways. Scope includes planning, design, and operation of both existing and new pedestrian facilities. Includes information and reference to accessibility laws, regulations, and standards.Design and construction of streets and highways in public rights-of-way must consider pedestrians. Purpose is to provide guidance for accommodating pedestrians along streets and highways. Scope includes planning, design, and operation of both existing and new pedestrian facilities. Includes information and reference to accessibility laws, regulations, and standards.