Traffic Engineering (CE 305) Lecture 7 - Fundamentals of Traffic Flow Theory Part 1 Traffic Stream is Influenced byIndividual vegiclesIndividual draiversDriver InetactionsRoadway geometryTraffic control devices * Not possible to decrive all aspects of traffic flow therothcally* need quantitive techniques to assess operational measures og highway performance Two types of flow/facility : Uninterru..

Overview : To ensure safety at intersections, drivers must be able to recognize the presence of an intersection, decelerate or stop appropriately, and identify conflicting vehicles to avoid potential collisions. Therefore, sight distance is a critical factor in the design and location of intersections. At intersections, drivers often need to observe their surroundings at angles wider than their ..

Intersection Design : Intersections connect roads and are designed based on vehicle dimensions, speed, and operating characteristics (e.g., articulated or rigid, low profile, long axle spacing). They must provide sufficient pavement for vehicles to transition between roads. The design begins with determining the kerb return radius to smoothly connect the major and minor roads, applicable to both..

Superelevation is primarily chosen for safety but also considers comfort and appearance, taking into account factors such as- the operating (design) speed of the curve (typically the 85th percentile speed),- the tendency of slow vehicles to track toward the center,- the stability of heavily laden trucks (particularly on downgrades or adverse crossfalls),- the difference in formation levels (nota..

Traffic LanesA traffic lane is a designated roadway section for one-way vehicle flow. Its number and width significantly affect safety, capacity, driving comfort, and operating speed.Australian and New Zealand roads typically use standard traffic lane widths of 3.5 m, allowing large vehicles to pass safely without lateral movement. Wider lanes (up to 3.7 m) are recommended for multi-combination ..

O Curve Geometry CalculationsO Earthworks calcuationsO  Earthworks Balance = Total Cut + Total fill