# Special Topics of Road Geometric Design

## Course Description:

Introduction to the geometric design of intersections and interchanges and their design at pre-final stage, through PC software in digital environment. The aim is to familiarize students with contemporary road design processes as well as the development of critical thinking and synthesis of knowledge from the bibliography for the formulation of specific suggestions - solutions related to basic of road safety aspects.

### Prerequisite Knowledge

Basic knowledge covered by the courses “GEOMETRIC DESIGN OF ROADS” and "ROAD CONSTRUCTION".

### Course Units

# Title Description Hours
2 Aspects of urban road design Urban road design issues (mild traffic, sharedspace, etc.). 1x4=4
3 Intersections (conventional) Intersection types, horizontal design, longitudinal design, edge-lines, visibility, layout elements, islands, small and large intersection types. 1x4=4
4 Intersections (roundabouts) Types, horizontal design, longitudinal design, configurations, visibility, aspects of operational analysis. 1x4=4
5 Interchanges Types, selection criteria, interchange operational area, distances, lane equilibrium, weaving, collector - distributorroads, exits - entrances from - to ramps, visibility, horizontal – vertical – cross sectional geometric design (main road and ramps, curved exits, entrances, ramp lengths, acceleration – deceleration lanes). 2x4=8
6 Road side equipment Vehicle restraint systems EN1317. 1x4=4
8 Special issues for determining critical road geometric parameters Determination of critical road geometric parameters based on vehicle dynamics, variable grades, 3D visibility. 1x4=4
9 Human factor in road design Human factor in road design. 1x4=4
10 Road safety audits Introduction to road safety audits, process, control steps, road safety auditors - inspectors, conducting road safety audit on urban freeway. 2x4=8
11 Course synopsis Course synopsis, project delivery, 1x4=4

### Learning Objectives

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

1. Participate in the computer aided road and intersection – interchange design at pre-final stage
2. Evaluate key road safety problems by suggesting relevant improvements to under design or existing road sections.

### 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 as well as the relevant road design software FM2018. By subject (individual). Project: Design of a road project at pre-final stage including intersection and basic interchange design as follows: functional classification of roads, selection of typical cross-sections, design on given DTM, horizontal – vertical – cross sectional geometric design, pavement drainage, visibility assessment, road safety criteria assessment, define position for drainage devices - preliminary hydraulic design, indicative design of structure works, pavement layer configuration, basic environmental design, access provision, bill of quantities. 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: 60%
• Assignments (projects, reports): 20%
• 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 kai Transport, General Secretariat of Public works. Department of Road Design Guidelines for the Design of Road Projects, Part 3, Alignment (OMOE-X), Greece 2001.
8. Henning Natzchka, “Road Design and Construction”, 3rd Edition. Klidarithmos Publications, Athens 2014.
9. PietzschWolfgang. “Design of Roads”, 2ηEdition. Giourdas Publications, Athens 1976.
10. Frantzeskakis I., I. Golias. “Road Safety”, Papasotiriou Publications, Athens 1994.
11. Brilon, W. : Roundabouts : A State of the Art in Germany. paper presented at the National Roundabout Conference, Vail, Colorado; National Cooperative Highway Research Program (NCHRP), USA 2005.
12. Roundabouts: An Informational Guide. Report no 672, Second Edition. Transportation Research Board, Washington, DC., USA 2010.
13. Highway Capacity Manual. Transportation Research Board of the National Academies, Washington, D.C., USA 2010.

## Lecture Time - Place:

• Friday, 08:45 – 12:30,
Rooms:
• Αμφ. Σιδ/κής

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