I want to make sure my logic is correct in distinguishing one from the other, if its not specified in the exam.
I have a problem that asks for the sight distance in an urban area and a jogger appears out of no where. parked cars are on both sides, one 12ft lane road.
Initially I was going to use SSD to find this value, but it wasnt in the answer set. My logic there, was that SSD was also used for "unexpected obstacles".
But doing some more research (and looking at the solution to realized my initial reasoning was wrong) led me to believe that using DSD was a better choice since the drivers field of vision is "cluttered" by other things such as a fairly narrow roadway (no where to escape/swerve, change direction, etc) and parked cars on both sides of the road. So its not necessarily a decision that needs to be made in this case, but an unexpected maneuver that needs to occur.
And we wouldn't used maneuver E since there is pretty much no where to go expect straight. We have to come to a complete stop so we don't hit the jogger. So the right answer was using maneuver B for DSD is the correct sight distance required to not hit the jogger.
Is my logic right? did I miss something? Im not entirely sold on it. Thank you for your input.
I have a problem that asks for the sight distance in an urban area and a jogger appears out of no where. parked cars are on both sides, one 12ft lane road.
Initially I was going to use SSD to find this value, but it wasnt in the answer set. My logic there, was that SSD was also used for "unexpected obstacles".
But doing some more research (and looking at the solution to realized my initial reasoning was wrong) led me to believe that using DSD was a better choice since the drivers field of vision is "cluttered" by other things such as a fairly narrow roadway (no where to escape/swerve, change direction, etc) and parked cars on both sides of the road. So its not necessarily a decision that needs to be made in this case, but an unexpected maneuver that needs to occur.
And we wouldn't used maneuver E since there is pretty much no where to go expect straight. We have to come to a complete stop so we don't hit the jogger. So the right answer was using maneuver B for DSD is the correct sight distance required to not hit the jogger.
Is my logic right? did I miss something? Im not entirely sold on it. Thank you for your input.