1 (0.25 pt) What is the standard assumption for perception reaction time in calc

Question

1 (0.25 pt) What is the standard assumption for perception reaction time in calculation of stopping sight distance n ASSHTO Green Book? (Choose Circle one) (A) 2 sees (B) 1.5 secs (C) 2.5 secs (D) 3.0 secs 2. (0.25 pt) What is the comfortable deceleration rate assumed in calculation of stopping sight distance in ASSHTO Green Book? (ChooseCircle one) (A) 9.6 ft/sec 11.2 ft/sec (C) 14.0 ftusec (D) 10.2 ft/sec 3. (0.25 pt) The object height changed from 1990 AASHTO Edition to 2011 AASHTO as following: (Circle/choose onc). (A) 3.5 ft to 2 ft (B) 0.5 ft to 2 ft (C) 2.0 ft to 0.5 ft (D) 0.5 ft to 3.5 ft 4. (0.25 pt) AASHTO represents longitudinal friction as: (Choose Circle one) in determination of stopping sight distance (A) a'g (B) g/a (C) ag (D) a'lg' 5. (0.25 pt) For determination of decision sight distance for avoidance maneuver related to speed/path/direction change on suburban road, the time gap chosen is ? (Choose/Circle one) (A) 9.1 secs (B) 10.2 to 11.2 secs (C) 12.1 to 12.9 secs (D) 14.0 to 14.5 secs 6. (0.25 pt) Side friction with increase in speed? (Choose/Circle one) (A) increases (B) decreases (C) does not change

Explanation / Answer

Ans 1 : B) 1.5 secs

The perception reaction time is the time that is required by the driver to decide on a movement , after he sees a yellow light on the traffic signal.

This time is a part of total reaction time , and it is 1.5 seconds according to the ASSHTO standards.

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