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Traffic volume, operational or design speed of the street, and the typical cross section of the street determines the required clear zone. The geometric design Tables 1, 2 and 3 in Section B-3-Roadway Geometric Design Criteria provide clear zone requirements for subdivision streets.
Jul 12, 2024 · The most recent version of the Road Design Manual is presented. This version supersedes all previous versions and incorporates all previous revisions. Division: Location and Design. Road Design Manual chapters. Road Design Manual Appendices.
Oct 1, 1973 · This guide is intended to aid professional personnel knowledgeable in the field of pavement design. Persons using this guide are responsible for its proper use and application.
- Planning and Geographic Considerations
- Special Considerations
- Traffic Analysis
- Drainage
- Soil Support
- Example
- Subgrade Preparation
- Base Construction
- Tack Coat
- Asphalt Surface Course
Residential street design standards can control the movement of traffic and help establish desirable traffic patterns. The speed at which motorists drive the routes they select can be influenced by street configuration. Residential streets and roads by design are low speed, low traffic, and short trip facilities. Truck traffic should be limited to ...
The two most important considerations in designing a pavement are traffic and drainage. If either is not adequately accounted for in the pavement design, the pavement structure will either be over-designed (and money wasted) or under designed (and result in premature and continual maintenance). Many subdivision and residential streets are initially...
All asphalt pavements must be designed using proper loading data to ensure adequate pavement performance. In residential street and road design, this data should be based on vehicular traffic estimates for the pavement’s design life. These estimates should include accurate counts of vehicles by type, weight, and number. This design manual considers...
Adequate pavement drainage is of great importance to all pavement designs. If the subgrade under the pavement becomes saturated, it will lose strength and stability and make the overlying pavement structure susceptible to break up under imposed loads. Both surface and subsurface drainage must be considered. All drainage must be carefully designed ...
The ability of the native subgrade soil to support loads transmitted through the pavement is one of the most important factors in determining pavement thickness. The California bearing ratio (CBR) test* provides a simple dependable index of a soil’s load-bearing capacity. It is widely used by many highway departments as well as other governmental a...
Nine CBR samples are taken on a proposed sub division street in Richmond and their values are as follows: The average CBR value for these samples is 10. However, samples #3, 7 and 8 were well below 10. If the pavement is designed based on an average CBR value of 10, pavement failures in the areas of test samples 3, 7 and 8 can be expected. This ma...
All underground utilities should be protected or relocated prior to grading because the subgrade must serve both as a working platform to support construction equipment and as the foundation for the structure, it is most important to see that it is properly compacted and graded. A visual examination will usually reveal the adequacy of the elevation...
Prior to placement of the asphalt concrete base course, the subgrade should be graded to the established requirements, adequately compacted, and all deficiencies corrected. The asphalt concrete base course should be placed directly on the prepared subgrade in one or more lifts, spread, and compacted to the pavement thickness indicated on the plans ...
Prior to placement of successive pavement layers, the previous course should be cleaned and, if needed, a tack coat of diluted emulsified asphalt applied. If the previous course is freshly placed and thoroughly clean, the tack coat may be eliminated.
Material for the surface course should be asphalt concrete placed in one or more lifts to the true line and grade as shown on the plans or set by the owner. The asphalt concrete should conform to Virginia Department of Transportation’s specifications for the specified mix. The asphalt surface should not vary from established grade by more than one-...
APPENDIX B(1) – SUBDIVISION STREET DESIGN GUIDESECTION B(1) – 1 – INTRODUCTIONINTRODUCTIONThis document is an appendix of VDOT’s Road Design Manual and is intended for users of VDOT’s Secondary Street Acceptance Requirements for the d. velopment of new residential and mixed-use streets functionally classified as “local” streets ...
The right-of-way requirements are defined in the Subdivision Street Design Guide (Appendix B (1) of the Road Design Manual, 2011 (VDOT)) and the Road Design Manual, 2011 (VDOT). When an existing state maintained road is widened, the additional right-of-way should be dedicated as follows: 1.
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This manual has been prepared to promote uniformity in design procedures for all designers and technicians involved in the development of plans for Virginia’s highways. It is intended to
