Fundamentals of Transportation/Sight Distance/Additional Problems

Additional Questions

 * 1) What happens if an accident is caused by poorly designed roads? → Lawsuits
 * 2) Explain Stopping Sight Distance again → = perception reaction distance + braking distance
 * 3) Isn’t 200 m long distance for braking → Yes unless very high speed on very slick surface (or going downhill).
 * 4) Is higher coefficient of friction used in road design? → Not too often, more often taken as a function of materials and construction, and wear and tear on road (older roads have less friction).
 * 5) Does coefficient of friction properly account for the ways cars brakes work and the manner in which drivers apply the brakes?
 * 6) Are stopping distance (related to accident reconstruction) admissible as evidence in court? Would this be by a licensed professional engineer?  → Yes
 * 7) How close are accident reconstruction calculations to be actual accidents? → Should be on average correct …
 * 8) For stopping distance, why don’t we have a factor to include vehicle size and weight?
 * 9) Why would the grade “G” be positive in the stopping distance equation? What would the sign be in the Stopping Distance Equation. What does a negative grade mean if you are were assuming to be going downhill?
 * 10) Describe the interaction between gravity and friction when going up or downhill. Is friction helped or hindered?
 * 11) Why can cosine and sine be ignored in calculations? --> Small angle approximations.
 * 12) What are the steps in accident reconstruction
 * 13) If you have an accident reconstruction problem, do you incorporate grade when finding friction? Yes, but the grade is known.
 * 14) How are skid marks useful in determining initial speed of vehicle?
 * 15) What affects the friction force?
 * 16) What can stopping distance measure be used for?
 * 17) What effect does grade have on stopping distance?
 * 18) What if more or less skid-marks found at an accident scene.  How are averages computed when distances are far apart?
 * 19) What is average perception reaction time given by AASHTO
 * 20) What is the maximum grade of a driveway?
 * 21) What type of braking is assumed in the stopping distance equation?
 * 22) When an object is sliding on an inclined surface, what two forces are operating on it?
 * 23) When is the road grade equal to 0.
 * 24) Why is accident reconstruction performed?  How does it work?

/Additional Problems