Week 1 Challenge

1. Create a design summary report (DSR) for the following items for any highway you are aware of in your region. Mention the highway name, and location: -

1. Category/Class of the road.
2. Design speed of the road.
3. Terrain classification.
4. Travel Lane width.
5. Typical min. cross slope.
6. Horizontal curve radius without superelevation.

Here's a sample Design Summary Report (DSR) for National Highway-44 (NH-44), which is one of the major highways in India, passing through Jammu & Kashmir (specifically the Jammu–Udhampur–Banihal–Srinagar–Baramulla section):

Design Summary Report (DSR)

Project Name: National Highway-44 (NH-44)
Location: Jammu & Kashmir, India (Section: Udhampur to Banihal)

a. Category/Class of the Road:
National Highway (NH) – Access-Controlled / Partially Controlled Expressway (as per IRC: SP:84 and NHIDCL/ MoRTH guidelines)

b. Design Speed of the Road:

• Mountainous Section: 40–50 km/h
• Rolling Terrain Sections: 60–80 km/h
  (Depending on the specific location and terrain, lower design speeds apply in tunnels and steep ghat sections.)

c. Terrain Classification:
Mountainous and Steep (Hilly) terrain (as per IRC:73 classification)

d. Travel Lane Width:

• 3.5 m per lane
• Typical cross-section: 2-lane or 4-lane with paved shoulder depending on location.

e. Typical Minimum Cross Slope (Camber):

• Paved Surface (Bituminous): 2.5%
• Unpaved Surface/Shoulder: 3.0–4.0%

g. Horizontal Curve Radius without Superelevation:
Assuming a design speed of 50 km/h and no superelevation,
Using the formula from IRC:
R=V²/127(f+e)

Where:

• V = speed in km/h = 50
• f = lateral friction (assumed 0.15)
• e = 0 (since superelevation is zero)

R=50²/127×0.15

=250019.05

≈131.2 Meter

So, the minimum horizontal curve radius without superelevation = ~131 meters for 50 km/h.

2 What is the typical roadway project life cycle workflow? List out in points. What is the typical roadway design workflow? Also, list out all the experts needed on a roadway project.

Here’s a structured answer to your question covering the roadway project life cycle, roadway design workflow, and expert team required for a typical roadway project:

2.1 Roadway Project Life Cycle Workflow (Typical Stages)

1. Project Initiation / Conceptualization
• Identification of need
• Feasibility Study
• Preliminary Surveys and Reports
2. Planning and Pre-Construction
• Traffic Studies
• Environmental and Social Impact Assessment (ESIA)
• Land Acquisition Planning
• Utility Identification & Planning
• Alignment finalization
3. Detailed Project Report (DPR) / Preliminary Design
• Geotechnical Investigations
• Hydrological Studies
• Preliminary Cost Estimation
4. Design & Engineering
• Detailed Engineering Design
• Preparation of BOQ, Drawings & Technical Specifications
5. Tendering & Contracting
• Preparation of Bid Documents
• Bidding Process and Contractor Selection
• Contract Award
6. Construction
• Site Mobilization
• Earthworks, Structures, Paving
• Quality Control & Supervision
7. Project Monitoring & Quality Assurance
• Project Management and Monitoring
• Reporting and Documentation
8. Commissioning & Opening to Traffic
• Final Inspection
• Rectification of Punch List Items
• Handover & Inauguration
9. Operation & Maintenance
• Routine and Periodic Maintenance
• Performance Monitoring
• Asset Management
10. Rehabilitation / Upgradation (after design life)

• Widening / Strengthening
• Major Maintenance or Redevelopment

2.2 Typical Roadway Design Workflow

1. Reconnaissance Survey
2. Topographic Survey using GPS/Total Station/LIDAR
3. Traffic Surveys (OD, Traffic Volume, Axle Load)
4. Soil and Geotechnical Investigations
5. Hydrological and Hydraulic Studies
6. Environmental & Social Assessments
7. Alignment Finalization (Horizontal & Vertical)
8. Pavement Design (Flexible / Rigid)
9. Cross-Drainage & Structure Design (Culverts, Bridges, Viaducts)
10. Typical Cross Section Design
11. Road Safety Features & Signage
12. Design of Intersections, Interchanges, Service Roads
13. Preparation of Detailed Drawings (Plan, Profile, X-sections)
14. Preparation of BOQ, Cost Estimates
15. Design Reports & Technical Justifications
16. Independent Review/Proof Checking (if required)

2.3 Experts Required on a Roadway Project

Attached Table no 1 separate sheet

3. What are the important geometrical parameters of a horizontal alignment and vertical profile? When is a vertical curve needed? List the formula with a diagram for vertical curve. List all types of vertical curves with the diagrams.

1. Important geometric parameters of horizontal alignment
2. Important geometric parameters of vertical profile
3. When is a vertical curve needed?
4. Formula for vertical curve with diagram
5. Types of vertical curves with diagrams

3.1 Important Geometric Parameters of a Horizontal Alignment

Attached Table no 2 separate sheet

3.2 Important Geometric Parameters of Vertical Profile

Attached Table no 3 separate sheet

3.3 When is a Vertical Curve Needed?

Vertical curves are required when two different gradients meet, to ensure:

• Smooth ride quality
• Comfort and safety for vehicles
• Adequate sight distance (SSD/OSD)
• Proper drainage

Without vertical curves, sudden gradient changes can be uncomfortable and dangerous.

3.4 Formula for Vertical Curve Design

Summit Curve (SSD-based design):

L=(V)²/2g(S+(V²/2gG))

OR

L=(SSD)²/2(h1+h2) (Simplified)

Sag Curve (headlight sight distance-based):

L=(SSD)²/2(H+SSD⋅tan(θ))

Where:

• L = length of vertical curve (m)
• V = design speed (m/s)
• G1,G2 = two grades (in decimal)
• A=G1−G2 (absolute grade difference)
• S = sight distance (m)
• h1, h2 = height of eye and object (e.g., 1.2 m, 0.15 m)

Diagram of a Vertical Curve

Sumit curve Drawing Separate sheet no 1

Sag curve Drawing Separate sheet no2

Summit Curve (Convex)

3.5 Types of Vertical Curves with Diagrams

Attached Table no 4 separate sheet

Note: Parabolic curves are commonly used for both summit and sag curves due to their ease in computation and comfortable transition.

4. When is superelevation necessary? Show diagrammatical presentation of super concept.

When is Superelevation Necessary?

Superelevation is the transverse slope provided to the pavement surface on horizontal curves to counteract the centrifugal force acting on a moving vehicle.

Superelevation is necessary when:

1. Road alignment includes horizontal curves
   – To help vehicles safely negotiate the curve at design speed.
2. To balance centrifugal force
   – It tilts the vehicle inward, reducing the tendency to skid or overturn.
3. For enhancing ride comfort
   – A smooth transition from straight to curved sections reduces jerks and vibrations.
4. To reduce side friction demand
   – In combination with curve radius and friction, it ensures vehicles stay safely on the curve.

Typical Situations Where Superelevation is Required:

Attached Table no 5 separate sheet

Formula for Superelevation (e):

e+f=V²/127R

Where:

• e = superelevation (in decimal)
• f = lateral friction factor
• V = speed in km/h
• R = radius of the curve in meters

Diagram of Superelevation Concept

Diagram attached separate sheet no 2

Diagram attached separate sheet no 2

Here's a simplified conceptual diagram showing superelevation:

➤ Vehicle Negotiating Curve with Superelevation ➤

Key Points in Diagram:

• Outer edge is elevated relative to the inner edge.
• Slope (e) is provided from the centerline or inner edge to outer edge.
• Helps the vehicle stay on the curve without skidding.

Would you like a properly illustrated PDF or editable slide showing the superelevation concept with real-world examples or case-specific values?

5. List out the typical set of submission needed for a roadway project.

Here's a comprehensive list of the typical set of submissions required during the lifecycle of a roadway project, categorized by project stages:

1. Pre-Construction / Planning Stage Submissions

Attached Table no 6 separate sheet

2. DPR / Design Stage Submissions

Attached Table no 7 separate sheet

3. Tendering & Construction Stage Submissions

Attached Table no 8 separate sheet

4. Operation & Maintenance Stage Submissions

Attached Table no 9 separate sheet

6. Draw a typical cross section with following parameters –

1. 12’ travel lane
2. 10’ shoulder lane
3. 2% cross slope
4. 2’ berm
5. End conditions with cut/fill of 6:1 and 4:1
6. Ditch condition of front slope 4:1, back slope 4:1, 3:1

Diagram attached separate sheet 3

Diagram attached separate sheet 3