TABLE OF CONTENTS Larry J. Shannon, P.E.
Highway Department Manager
DLZ Ohio, Inc.
Columbus, Ohio
This chapter begins with a description of the overall transportation development process, and then presents comprehensive information on the various elements of highway location and design. Included is the determination of horizontal and vertical alignment, with attention to obtaining proper sight distance and superelevation. The design of roadway cross sections, intersections, ramps, and service roads is addressed. Traffic aspects include an introduction to intelligent vehicle highway systems and the use of high-occupancy vehicle lanes. A presentation on preparation of highway construction plans and organizing CADD drawings is also provided. A list of references, which are noted in the text, concludes the chapter. Some design issues related to roadside safety are also discussed in Chap. 6.
The beginnings of any roadway project involving government money are found in a statewide transportation planning program. The state transportation department develops a set of goals and objectives which take into account social, economic, environmental, and developmental goals of other state, federal, and local agencies. Based on these goals and objectives, the department identifies transportation improvement needs throughout the state. The approach is from a multimodal standpoint; that is, not just highways are considered, but all forms of transportation, including public transportation, railroads, water, aviation, bikeways, and pedestrian ways (Ref. 6).
In order to evaluate various projects from various parts of the state, information is collected consisting of the following items: transportation inventories,...
