GEOMETRIC DESIGN OF HIGHWAYS Introduction 1 Chapter 1

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GEOMETRIC DESIGN OF HIGHWAYS Introduction 1

GEOMETRIC DESIGN OF HIGHWAYS Introduction 1

Chapter 1 Introduction 1/3/2022 Basic Design Control 2

Chapter 1 Introduction 1/3/2022 Basic Design Control 2

Definitions: n n Geometric design: pertains to the design of the visible features of

Definitions: n n Geometric design: pertains to the design of the visible features of the highway Design Controls: They are the factors affecting the different geometric design elements of highways. 1/3/2022 Introduction 3

GEOMETRIC DESIGN COURSE CONTAINS: Chapter 1: Introduction. Chapter 2: Basic Design Control. Chapter 3:

GEOMETRIC DESIGN COURSE CONTAINS: Chapter 1: Introduction. Chapter 2: Basic Design Control. Chapter 3: Sight Distance. Chapter 4: Horizontal Alignment. Chapter 5: Vertical Alignment. Chapter 6: Cross-sectional elements. Chapter 7: Highway Intersections. 1/3/2022 Basic Design Control 4

Chapter 2 Basic Design Control 1/3/2022 Basic Design Control 1

Chapter 2 Basic Design Control 1/3/2022 Basic Design Control 1

Basic Design Control Highway Classification Primary Topography Control Traffic Basic Design Control Speed Dependent

Basic Design Control Highway Classification Primary Topography Control Traffic Basic Design Control Speed Dependent Vehicle Control Driver 1/3/2022 Basic Design Control 2

Primary Control 1 -Highway Classification Freeway Rural Local road Highway Classification Freeway Urban 1/3/2022

Primary Control 1 -Highway Classification Freeway Rural Local road Highway Classification Freeway Urban 1/3/2022 Major highway Basic Design Control Major street Local street 2

Primary Control( Cont. ) 2 -Topography q. The nature of the surrounding topography and

Primary Control( Cont. ) 2 -Topography q. The nature of the surrounding topography and land use may govern in many cases the choice of best alternative of highway location. q. It also governs highway slopes, drainage, speed, … 1/3/2022 Basic Design Control 3

Primary Control (cont. ) 3 -Traffic Data: It must include volume, Composition, and projection

Primary Control (cont. ) 3 -Traffic Data: It must include volume, Composition, and projection n Traffic Volume Average Daily Traffic (ADT), AWDT, AMDT, AADT. Design Hourly Volume (DHV) = k × ADT Rural: K=11 -20%, Urban: K=7: 18% n Traffic Composition Percent of non passenger cars (T) Vehicle Type Equivalent Factor PC Bus SUT Trailer Hand Driver Car 1 2 2. 5 3. 5 6 1/3/2022 Basic Design Control 4

Primary Control (cont. ) n Traffic Projection Normal Growth, Generated, Attracted, Developed. Total Attracted

Primary Control (cont. ) n Traffic Projection Normal Growth, Generated, Attracted, Developed. Total Attracted Generated Developed N. Growth Current Future ADT = Current ADT (1+ TPF) 1/3/2022 Basic Design Control 5

Dependent Control 1 -Speed (Distance over time……. . mph, kph, ft/sec. ) Running speed:

Dependent Control 1 -Speed (Distance over time……. . mph, kph, ft/sec. ) Running speed: Distance / overall time. Operating speed: The highest overall speed in such a way it is not greater than the design speed. Design speed: The speed selected for design of highway elements. - It is the max. safe speed - It is the speed that at least 95% of the drivers use speed less than or equal to it. 1/3/2022 Basic Design Control 6

Dependent Control (cont. ) 2 -Design Vehicle Is that vehicle selected to represent all

Dependent Control (cont. ) 2 -Design Vehicle Is that vehicle selected to represent all vehicles on the highway Types: - Passenger Car (PC) - Single Unit Truck (SUT) - Bus - Semitrailer Combination (WB-40) - Semitrailer Combination (WB-50) - Semitrailer Fulltrailer (WB-60) Single Unit Truck (SUT) is the type of the vehicle considered according to Egyptian Specifications 1/3/2022 Basic Design Control 7

Dependent Control (cont. ) Design Vehicle 13. 4 m Max. 12. 8 m Turning

Dependent Control (cont. ) Design Vehicle 13. 4 m Max. 12. 8 m Turning 8. 7 m Min. SUT 9. 1 m 2. 6 m Turning Radii PC SUT BUS WB-40 WB-50 WB-60 Min. Turning 7. 3 12. 8 12. 2 13. 7 Min. Inside 4. 7 8. 7 7. 1 6. 0 6. 9 1/3/2022 Basic Design Control 8

Designation They are the major controls for which a given highway is designed n

Designation They are the major controls for which a given highway is designed n Design Year ( Ex. 20 Years Ahead) n Current ADT n Future ADT n DHV n Directional Distribution (D) n % Truck (T) n Design Speed (V) n Control of Access ( None, Partial, or Full) n Design Level of Service (A, B, C, D, or E) 1/3/2022 Basic Design Control 9

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