tailieunhanh - Design Manual Metric 2009 Part 1

Tham khảo tài liệu 'design manual metric 2009 part 1', kỹ thuật - công nghệ, cơ khí - chế tạo máy phục vụ nhu cầu học tập, nghiên cứu và làm việc hiệu quả | Design Manual M 22-01 Metric Washington State Department of Transportation Environmental and Engineering Service Center Design Office Alternate Formats Persons with disabilities may request this information be prepared and supplied in alternate formats by calling the Washington State Department of Transportation ADA Accommodation Hotline collect 206-389-2839. Persons with hearing impairments may access Washington State Telecommunications Relay Service TTY at 1-800-833-6388 or Tele-Braille at 1-800-833-6385 or Voice at 1-800-833-6384 and ask to be connected to 360-705-7097. Additional copies may be purchased from Washington State Department of Transportation Directional Documents and Engineering Publications PO Box 47408 Olympia WA 98504-7408 Phone 360-705-7430 Fax 360-705-6861 E-mail engrpubs@ Internet http fasc Engineering Publications This publication is also available on CD-ROM or via Internet on the WSDOT homepage at http eesc design policy Foreword This Design Manual is a guide for our engineering personnel. It provides policies procedures and methods for developing and documenting the design of improvements to the transportation network in Washington State. The manual supplements the engineering analyses and judgment that must be applied to improvement and preservation projects. It provides uniform procedures for documenting and implementing design decisions. The designer must understand that the design environment changes rapidly and often without warning to the practitioner. To track every change and to make improvements based upon each is not feasible. The intent of this manual is to provide a range of recommended values for critical dimensions. Flexibility is permitted to encourage independent design that is tailored to particular situations. The fact that new design guidelines are added to the Design Manual through the revision process does not imply that existing features are deficient or .