level: Level 1
Questions and Answers List
level questions: Level 1
Question | Answer |
---|---|
10 Key intersections | Adequate capacity - form of control conflict points Preference major flows Define veh paths ad SD form of control All RU Control veh speeds |
Min conflict points | Stag T's to decrease CP. left stagger 67% greater |
Cost Consequences of geometric design | Land, pavement, accidents, maintenance |
Design standards | Costs, terrain, traffic volume, hierarchy, safety, environment |
Desired speed | Drivers decision |
Operating speed | estimation |
Design speed | greater than operating |
Factors affecting design | Design speed, safe f and e |
Types of curves | Circular, transition, reverse |
Curves to avoid | Compound Broken back |
Friction depends on | road surface tyres breaks weather |
Superelevation | prevent sliding, slipping decreases hazards less than 10% |
Transition curve criteria | Rate of change of radial acc - Forces on body Rate of rotation (warp) - comfort Relative grade |