## Course Description:

Introduction to roads geometric design as well as details related to design parameters per design stage. Means for drafting a road design project in two-dimensional environment as well as critical elements required during its three-dimensional assessment. Simulation of the vehicle in the process of determining control design values. Particular emphasis is given on qualitative and quantitative indicators directly related to safety and operational aspects of road design.

### Prerequisite Knowledge

Basic knowledge of Geometry

### Course Units

# Title Description Hours
1 Introduction Concept of horizontal, vertical and cross-sectional design, road functional classification. 1x4=4
2 Vehicle dynamics aspects, friction mechanisms, speed values Forces applied on the vehicle (aerodynamic, tire - road contacting force, vehicle weight), tractive - braking forces, critical speed values, longitudinal and lateral friction. 1x4=4
3 Vehicle simulation in road design Existing vehicle dynamics approach during the determination of control road geometric parameters, assumptions, determination of minimum horizontal radius - speed for skidding and roll-over, climbing lanes. 1x4=4
4 Horizontal design Road horizontal design elements, tangent, transition curve – types, circular arc, control values, safety criteria (qualitative road assessment based on design consistency). 2x4=8
5 Vertical design Road vertical design elements, longitudinal grades, crest – sag vertical curves, control values, road longitudinal profile. 1x4=4
6 Cross – sectional design Crown-sloped and single-sloped pavements, pavement rotation, pavement edge-line grades, cross – sectional and pavement edge-line diagrams. 1x4=4
7 Horizontal – vertical clearance, cross sections Dimensional definition of cross sections (horizontal – vertical clearance), road users, typical cross sections, cross sections elements, lateral configurations –road side equipment (in general), pavement widening - enlargements, road drainage issues - necessity to modify vertical profile, cross - sectional diagrams. 2x4=8
8 Visibility Geometric sight distance (stopping, passing, decision, intersection), psychological sight distance (depth of the driving space, of which the driver supposes to have it completely registered), visibility diagrams. 1x4=4
10 Road design stages Feasibility study, preliminary design, pre-final design, detailed design, backgrounds - precisions. 1x4=4

### Learning Objectives

Upon successful completion of the course, the students will be able to:

1. Perceive the design process and the degree of detail per stage of a road design project
2. Understand the limitations and commitments underlying the control values of critical geometric parameters
3. Apply basic principles and methods related to safe and operational road design
4. Assess combinations of critical design parameters regarding the quality of the design
5. Tackle common problems during road geometric design process

### Teaching Methods

 Teaching methods Lectures in class. Resolving of simple examples and problems in class. Notes, blackboard sketches, power point presentations. Students solve simple exercises utilizing mainly EXCEL and CAD software. By subject (individual). Series of independent exercises in the main subject areas of the theory, the synthesis of which is the design of a road section at pre-final stage. The course’s notes, the project, the exercises, the slides from the theory presentations, as well as related examples are uploaded on the mycourses.ntua.gr online platform.

### Student Assessment

• Final written exam: 70%
• Assignments (projects, reports): 10%
• Problems - Applications: 10%
• Oral exam: 10%

### Textbooks - Bibliography

1. American Association of State Highway and Transportation Officials (AASHTO). A Policy on Geometric Design of Highways and Streets, Fifth Edition. Washington, DC., USA 2011
2. Ed.German Road and Transportation Research Association, Committee, Geometric Design Standards. Guidelines for the Design of Roads, (RAΑ), Germany 2008.
3. Ed.German Road and Transportation Research Association, Committee, Geometric Design Standards. Guidelines for the Design of Rural Roads, (RAL), Germany 2012.
4. Ministry of Infrastructure and Transport, General Secretariat of Public works. Department of Road Design Guidelines for the Design of Road Projects, Part 1, Road Network Functional Classification (OMOE-X), Greece 2001.
5. Ministry of Infrastructure and Transport, General Secretariat of Public works. Department of Road Design Guidelines for the Design of Road Projects, Part 2, Cross Sections (OMOE-X), Greece 2001.
6. Ministry of Infrastructure and Transport, General Secretariat of Public works. Department of Road Design Guidelines for the Design of Road Projects, Part 3, Alignment (OMOE-X), Greece 2001.
7. Henning Natzchka, “Road Design and Construction”, 3rd Edition. Klidarithmos Publications, Athens 2014.
8. Hassan, Y., Easa, S. M. and Abd El Halim, A.O. Analytical Model for Sight Distance Analysis on Three-Dimensional Highway Alignments, Transportation Research Record, Vol. 1523, 1996.
9. Zimmermann, M. Increased Safety Resulting from Quantitative Evaluation of Sight Distances and Visibility Conditions of Two-Lane Rural Roads. Proceedings of the 3rd International Symposium on Highway Geometric Design, TRB, Chicago, USA 2005.
10. Dixon J.C., "Tires, Suspension and Handling". Second Edition. Society of Autimotive Engineers, Inc Warrendale, Pa., United Kingdom 1996.
11. Gillespie T.D. “Fundamentals of Vehicle Dynamics”. Society of Mining Metallurgy and Exploration Inc.1992.
12. Heisler H. "Advanced Vehicle Technology". Edward Arnold. A Division of Hobber & Stoughton, Germany 1993.
13. Jazar R.“Vehicle Dynamics, Theory and Application”. Third Edition. Springer International Publishing AG, 2017, Switzerland2017.

## Lecture Time - Place:

• Friday, 09:45 – 13:30,
Rooms:
• Αμφ. 1/2

© 2017 School of Civil Engineering, ΕΜΠ