Horizontal Curve and Road Design Problems
Problem 1: Circular Curve Design
A simple circular curve exists with a degree of curve D=12 and e=0.08. A structure is proposed on land on the inside of the curve. Assume the road is on level grade. Determine:
- The radius of the curve.
- The current maximum safe speed on the curve.
- The maximum distance allowable between the proposed structure and the centerline of the curve, such that the current maximum safe speed of the curve would not be reduced. Perception-reaction time is 2.5 seconds and fs=0.16
Solution:
Cargo Terminals: Types, Operations, and Handling Equipment
Cargo Terminal Types and Operations
General Cargo Terminals
Classification:
- Conventional: These are older terminals, initially not designed for unitized cargo. They feature a simple layout and generally don’t require extensive areas for cargo handling. Dimensions and installations depend on the cargo type, with open storage areas, light storage facilities, silos, and horizontal storage.
How They Operate
For loading and discharging, they use mobile shore cranes with a lifting capacity of 20-30 metric
Read MoreRoad Surface Treatments: Bituminous Layers and Irrigation
Road Surface Treatments Explained
Surface treatments involve applying a thin bituminous layer (1-4 cm). Their primary purposes are:
- To provide specific surface features like texture and waterproofing.
- To improve adhesion.
However, they generally do not increase the structural strength capacity or improve the evenness of the underlying pavement structure.
Gravel-Free Irrigation Methods
Black Irrigation
This involves surface irrigation on low-intensity traffic routes. It provides waterproofing, aging protection,
Read MoreConcrete Surface Repair: Strategies, Materials, and Techniques
Module 4
Concrete Surface Repair Strategies
The repair strategy is built around an existing losing stock position and is constructed by purchasing one call option and selling two call options for every 100 shares of stock owned. We use repair strategies when there is a communication breakdown. We can also use repair strategies to prevent a communication breakdown. For example, a miscommunication, a word or phrase that was not clear, not being able to hear the speaker, not understanding the speaker,
Read MoreUrban Street Design Elements: Medians, Parking, and Lanes
Medians and Central Reservations
The median or central reservation is defined as the longitudinal separation between carriageways on very wide streets when they are not passable. Its installation has advantages and disadvantages.
Advantages:
- Increased safety measures.
- Allows for future expansion of roadways.
- Provides visual separation (rupture).
- Serves as a pedestrian refuge.
- Acts as a barrier to nuisance traffic.
Disadvantages:
- Decreases the useful section of the road.
- Can sometimes be a barrier to the movement
Transportation Engineering: Key Concepts and Applications
Transportation Engineering: Key Concepts
In transportation engineering, the Level of Service (LOS) is a framework used to evaluate the quality of traffic flow on transportation systems, such as roads, highways, and intersections. It is defined in the Highway Capacity Manual (HCM) and serves as a critical tool for planning, designing, and managing transportation infrastructure.
Level of Service (LOS) Grades
- LOS A:
- Free-flow conditions with no congestion.
- High speeds, minimal delays, and full freedom to