Tuesday, November 13, 2018

From VDOT- Innovative Intersection: Roundabout

What Is Roundabout?

  • A circular, unsignalized intersection where all traffic moves counterclockwise around a central island
  • Traffic entering the roundabout slows down and yields to traffic already inside the roundabout
  • Roundabouts can be designed with one or more circulating lanes
  • Design options allow for right turns to be channelized to bypass the circulating lanes

When Should It Be Considered?

  • At intersections:
    • With heavy left-turn traffic or with similar traffic volumes on each leg
    • With crashes involving conflicting through and left-turn vehicles
    • With limited room for storing vehicles
    • Where there are limited nearby driveways

Benefits

  • Improved safety: Reduces the number of points where vehicles can cross paths and eliminates the potential for right-angle and head-on crashes.
  • Increased efficiency: Yield-controlled design means fewer stops, fewer delays and shorter queues
  • Safer speeds: Promotes lower vehicle speeds, giving drivers more time to react
  • Long-term cost effectiveness: No traffic signals means lower long-term costs for operations and maintenance
  • Aesthetics: Allows for landscaping and beautification

How to Navigate

Below shows how to navigate a roundabout intersection. Click the image to view a larger version or watch the video.
Roundabout navigation diagram

Conflict Points

The number of conflict points (locations where vehicle travel paths intersect) is one metric that can be used to evaluate the safety of an innovative intersection or interchange.
There are three categories: crossing, merging or diverging.
In general, merging and diverging conflict points — where vehicles are moving in the same direction — are associated with less severe crash types than crossing conflict points where vehicles are moving in opposite directions.
The diagrams below compare possible vehicle travel movements and associated conflict points at conventional four-leg intersections to a roundabout.
These diagrams represent a general case, with one travel lane in each direction, and do not take into account pedestrian or bicycle movements at an intersection or interchange.
When compared to a conventional four-leg intersection, a roundabout has 16 fewer crossing, 4 fewer merging, and 4 fewer diverging conflict points.

Conventional Intersection: Conflict Points

Conflict Point Diagram

Roundabout: Conflict Points

Conflict Point Diagram

Design Considerations and Screening

For detailed roundabout design criteria, see the Virginia Department of Transportation (VDOT) Road Design Manual, Appendix F, Section 2 (Intersection design, spacing standards)

Resources

Federal Highway Administration

Monday, November 12, 2018

Road Construction Ahead

Major Highway projects in Virginia: September-December, 2018
Click a construction project point on the map to view project details.
key

Friday, November 9, 2018

Stakeholders To Meet On Pilot Program Relating To Heavy Vehicles

Review of Enrollment in Federal Pilot Program or Project Relating to Heavy Vehicles on the Interstate

Who: Virginia Department of Transportation (VDOT) staff and external stakeholders from other state agencies, as well as interested industry organizations and their representatives.
What: In response to House Bill 1276 / Senate Bill 504 of the 2018 session of the Virginia General Assembly (Chapters 553 and 554, respectively), VDOT is convening a work group to identify the implications of the Commonwealth of Virginia's participation in a federal data collection pilot program, or project involving six-axle tractor truck semitrailer combinations weighing up to 91,000 pounds, and utilizing interstate highways. 
To this end and pursuant to the legislation, VDOT seeks to consult with stakeholders in reviewing:
  • (i) The fee structure for qualifying tractor trucks
  • (ii) The axle spacing for qualifying tractor trucks
  • (iii) Issues related to reasonable access from loading facilities onto a primary or secondary highway and interstate highways
  • (iv) The sufficiency of existing data in determining if certain routes and bridges should be excluded from the federal pilot program or project, and
  • (v) Any other issues as deemed relevant or appropriate by the Department
Input from the stakeholder community is an important part of this review and as a result, three meetings with stakeholders are planned:.
Friday, July 27, 2018, 10 a.m. – noonVirginia Housing Development Authority's Virginia Housing Center 
4224 Cox Road
Glen Allen, Virginia 23060
Conference room Henrico 1
 
The focus of the first meeting was to hear from stakeholders regarding their perspectives relating to potential participation by the Commonwealth of Virginia in any such federal pilot and the elements or factors to be reviewed pursuant to the legislation. 
Thursday, Sept. 13, 2018, 10 a.m. – noonJames Monroe Building
101 N. 14th St.
Richmond, Virginia 23219
Shared conference rooms E and D
The second meeting focused on VDOT’s proposed criteria and data requirements for participation in any such pilot program. 
Wednesday, Nov. 14, 2018, 10 a.m. - noon (Note: This is a change in the date of this meeting.)James Monroe Building
101 N. 14th St.
Richmond, Virginia 23219
Shared conference rooms C and D

The third and final meeting will be used to gather feedback on a draft report summarizing the results of the review, which will be provided to stakeholders prior to the meeting.
In order to ensure that meeting rooms have adequate capacity, RSVP to Keith Wandtke at Keith.Wandtke@vdot.virginia.gov, 804-786-1296, by July 24, 2018. If you have any questions prior to the meetings, forward those to Keith as well. 

Thursday, November 8, 2018

Roadway Management Conferece 2018

UPDATED SCHEDULE: Public Input Sought On Transportation Projects

RICHMOND, Va. – The Commonwealth Transportation Board (CTB) is holding nine meetings across the commonwealth through November where the public will have the opportunity to get the latest information, ask questions and provide input on the prioritization of transportation projects.
The meetings consist of an open house where attendees can review and provide feedback on the list of proposed local and regional projects that have been submitted for scoring through SMART SCALE, an objective and data-driven prioritization process to score projects according to critical transportation needs. The meetings will highlight the 468 applications for projects submitted by 158 local and regional governments across the state. 
Following the open house, a town hall session will engage public and transportation stakeholders in discussion and provide an opportunity to ask questions about transportation projects and priorities. There will be no formal public comment during the meetings.
Projects that have been determined to meet a need identified in VTrans, Virginia’s statewide transportation policy plan, will be advanced for evaluation and scoring. Scoring results will be made available to the public in January 2019.  Following public meetings in the spring, the CTB will use public feedback and the scoring data to select which projects to fund and be included in the next Six-Year Improvement Program by June of 2019.
The next public meetings are scheduled to be held at the dates, locations and times listed below:
Tuesday, November 13, 2018
at 4 p.m.
Hampton Roads District Office
7511 Burbage Drive
Suffolk, VA 23435
Thursday, November 15, 2018
at 4 p.m.
Homewood Suites–Chester
12810 Old Stage Road
Chester, VA 23836
Monday, November 19, 2018
at 4 p.m.
Lynchburg District Complex
Ramey Memorial Auditorium
4303 Campbell Avenue
Lynchburg, VA 24501
Wednesday, November 28, 2018 at 5:30 p.m.*
NOVA District Office
Potomac Conference Room
4975 Alliance Drive
Fairfax, VA 22030
Thursday, November 29, 2018
at 4 p.m.*
Fredericksburg District
Office Auditorium
86 Deacon Road
Fredericksburg, VA 22405
*Please note that these meetings dates have changed.  
If you are unable to attend a meeting, you may view the displays and provide your comments online. You can also mail comments on highway projects to Infrastructure Investment Director, VDOT, 1401 E. Broad St., Richmond, Virginia 23219, or Six-YearProgram@VDOT.Virginia.gov or on rail, public transportation and transportation demand management to Public Information Officer, DRPT, 600 E. Main St., Suite 2102, Richmond, Virginia 23219, or DRPTPR@drpt.Virginia.gov.
Comments will be accepted until Dec. 13, 2018.
Information sources:
Information on SMART SCALE, including project applications submitted for scoring: http://vasmartscale.org/resources/default.asp.