Question

Situation You are working as an engineer for Thurston County Public Works. The project you've been assigned entails examining placement of passing lanes along sections of Yelm Highway SE. During a public meeting, several members of the general public indicated that they want to have passing lanes for the entirety of the stretch of highway indicated below. Hur Family Farm Country Tutor Tom's v orner Canter Do the following: 1) Evaluate whether placing a passing lane is a good idea. 2) Justify your decision using sight distance as your central argument. In your justification, utilize the following: a. Equation relating to sight distance and/or passing sight distance b. Imagery (e.g., drawings, Google Earth, etc.) C. Definition of sight distance and/or other related concepts to sight distance 3) Provide a short narrative summary addressing the public's desire in light of your evaluation of the section of roadway. Your submittal should be no more than one-page long (single-spaced, 12-point font).

Answer 1

0. Ag an Engineer for Thurston County Public Works, I started to survey the given section of Yelm Highway on the basis of its traffic flow along the Highway, since, due to large no. of mix traffic fast moving vehicle needed a passing lane for their proper flow. Hence, there should be a passing lane 9. since, the main purpose of passing lane is to provide lane for the fast moving venice to move easily and seemlessly. Main hindrances for the fast moving vehicles grouses on the Highway is regarding sight distance (stopping sight distance or Ouerta king sight distances] . since, ssD(stopping sight distance) which is not a major problem as the number of lanes increases from providing an extra lane as passing Lane is get SSD : vt + v2 where, v = velocity of - vehicle to reaction time E G S acceleration I due to gravity i de focoefficient of S Bed longitudnal friction 2

on the other hand, ost (overtaking sight distance) which is a real problem due to mix traffic can be resalue by hooviding a passing lane. Due to passing lane, fast moving vehicle easily pass throught slow moving vehicles. since, osp comprises of following terms → LANEI p... JAN EN BRAN LANEI b Tag distance s due to reaction - ime (d, OSD = , +da. di = Vs Xt (reaction time) d2 = b +S,+52 where, b=VgXT s & S, = space headway T= 2/sitsa) as acceleyatim of vehide a 1. since, due to mix traffic and high congestion in the provided section of highway , public's desire to have a passing Lane is fully justified This will ease their daily routine movement on the Highway section provided.