In AASHTO design guidelines decision sight distance is 27 O

In AASHTO design guidelines, decision sight distance is 27 O (A) the same as brake reaction distance O (B) the distance an auto travels when approuching a signalized internection, during which the driver decides whether to go through dhe intersection or to come to a stop O (C) the distance in advance of an exit ramp that the ramp destination sign must be placed ) the distance needed to detect an unexpected condition on a roadway, select an appropriate path, and complete a maneuver O (D

Solution

27.

The 1994 AASHTO Green Book defines the Decision Sight Distance as: The distance needed for a driver to detect an unexpected or otherwise difficultto-perceive information source or condition in a roadway environment that may be visually cluttered, recognize the condition or its potential threat, select an appropriate speed and path, and initiate and complete the manoeuvre safely and efficiently.

Thus (D) the distance needed to detect an unexpected condition on a roadway, select an appropriate path and complete a maneuver. will be correct

28.

Transfer cost will not be appropriate for such a model as that is something which is not going to happen on a daily basis and thus cannot be considered as a daily direct user cost input. Thus (C) will be correct repsonse