Question

Problem 6 - The figure 2 shows a design vehicle stopped on a minor road at a major road intersection The design speed of the major road is 60 mph. Only for maneuver 1 (right turn) shown in the figure, determine the design intersection sight distance (ISD) assuming passenger car, single-unit truck or combination truck as design vehicles. Minor Rd. 361 Figure 2 Major Rd.

Answer 1

PROBLEM 6

The answer is shown in below by hand written notes :

Problem - 6 Given Design Answer data; speed of major road = 60 mph Vnajour] Minor rol Major Rolo LIT The design intersection sight Distance (I so) only for maneuver & as shown in the figure for passenger car, single unit truck (or) combination truck as design vehicles. Intersection sight distance (aso) ISD - 1.47 Vrajar x tg

where, Vonino - Design speed of major road vehicle in mph. Time har gap for for minor road vehicle to enter the major road in seconds tq = crossing maneuver from the Time minor gap for road. time gap (tg) (s) at design speed of major road 6.5 Design vehicle passenger car single unit truck combination truck 8-5 10.5 NOTE: Time gaps For a stopped Vehicle to cross a two lane high way with no median. For multilane road ways or medians For crossing maneuvers the cross road way with more than 2 lanes including turn lanes add oogs for passenger cars and o.ts for trucks for each additional Lane.

the give problem having 5 lanes, Additional time gap for passenger car xo.5 = 2-5 s Additional time gap for trucks = 5x 0. 7 = 3.5s overall time gap for passenger car ta = 6.5 + 2-5 as overall time gap for single unit truck to = 8.5+ 3.5 = 12 s overall time gap for combination truck tg = 10.5+ 3.5 = 145 Intersection sight distance For a) Design vehicle as passenger car ISD = 1.474 major .tg. = 1:47 x 60 x 9 ISD = 793.8 m

b) tg. for single unit truck ISO = 1-47 Vmajor = 1.47 x 60x 1058.4 12 m truck c) for combination Iso= 1.47 Imajor - tg. - 1-47 x 60 x 14 - 1 2 3 4.8 m.