CVL 735- Final Exam Guide - Comprehensive Notes for the exam ( 36 pages long!)

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Why sight distance is important on sag vertical curves. Sight distance is important on sag vertical curves because at night vehicles can only see as far as their headlights will let them. Q(cid:1006). (cid:1007) road desig(cid:374) ele(cid:373)e(cid:374)ts that (cid:373)ight affe(cid:272)t a dri(cid:448)er(cid:859)s perception-reaction time: grade, design speed, road friction, passing sight distance, stopping sight distance, decision sight distance. Why spiral length for a horizontal curve on a four lane might be longer than that required for a two- lane road. The centreline for a 2-lane road will have a smaller radius than the centreline for a 4-lane road. 3 advantages/trade-offs of a roundabout approach centerline alignment offset left of center of the inscribed circle of a roundabout. Beneficial for accommodating large trucks with small inscribed circle diameter allows for larger entry radius while maintaining deflection and speed control. May reduce impacts to right-side of roadway.