Laserfiche WebLink
September 11, 2021 <br />Page 64 <br />VMT-VHT Summary <br />The foundation of a BCA is the vehicle miles traveled (VMT) - vehicle hours traveled (VHT) <br />summary. This summary describes how an improvement concept affects traffic volume, pattens, and <br />congestion. A typical highway improvement facilities mobility, thus inducing longer trips and more <br />VMT while simultaneously decreasing congestion and VHT. <br />Table 15 documents VMT and VHT changes modeled under Northwest Metro Mississippi River <br />Crossing Feasibility Analysis Concepts. This tables shows the expected dynamic — all four concepts <br />increase VMT while decreasing VHT. Concept 2 (mobility improvements to Highway 10, 101 and <br />610) has the greatest impact on VMT and a middling impact on VHT. Concept 4 (a new expressway <br />river crossing) has less than half Concept 2's impact on VMT but produces significantly more travel <br />time savings. <br />Table 15: Northwest Metro Mississippi River Crossing Feasibility Analysis; Daily VMT-VHT Summary* <br />Daily Travel Summaries <br />Facility Type Concept 1 Concept 2 Concept 3 Concept 4 <br />Vehicle -Miles Traveled (VMT) <br />Vehicle -Hours Traveled (VHT) <br />Freeway 330,000 <br />Non -freeway -270,000 -280,000 <br />Total 60,000 100,000 <br />Freeway 4,600 3,800 <br />Non -freeway -5,900 -6,200 <br />Total -1,300 -2,400 <br />380,000 -50 000 <br />-60,000 <br />90,000 100,000 <br />40,000 40,000 <br />- 1,500 -1,800 <br />- 800 -1,400 <br />- 2,300 -3,200 <br />* Results presented in relation to 2040 no -build scenario - traditional telecommuting assumptions <br />Changes in VHT, or travel time savings, tend to be the dominant source of benefits for highway <br />mobility projects. All four concepts have VHT savings exceeding 1,000 vehicle hours per day in year <br />2040. Concept 4 (four -lane expressway river crossing) provides the greatest VHT savings with over <br />3,000 hours per day. Concepts 2 and 3 provide slightly lower VHT savings at just over 2,000 hours <br />per day. <br />Another important factor in user benefits is safety, which are captured in VMT since freeways are <br />statistically safer than non -freeways. Shifts in VMT from non -freeways to freeways indicate <br />improved safety. These results show Concepts 1 and 2 with a net shift in VMT from non -freeway to <br />freeway. However, the reverse is true for Concepts 3 and 4. <br />Northwest Metro Mississippi River Crossing Feasibility Analysis <br />