Marshalltown US 30 By-Pass: Traffic Assignment Study, September 17, 1987

(1987) Marshalltown US 30 By-Pass: Traffic Assignment Study, September 17, 1987. Transportation, Department of

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Abstract

This is a traffic assignment for the proposed US 30 by-pass near Marshalltown, Iowa. The purpose of this study is to estimate the amount of traffic which might use the proposed route. This is necessary for pavement design, access analysis, and other design areas. A twenty year design period will be used for this appraisal (to the year 2007). This study will estimate average daily and hourly traffic and truck use. These volumes will be reported as average daily traffic (ADT), design hourly volume (DHV), and average daily truck traffic (ADTT). The traffic assignment will be the sum of four kinds of traffic. The first type estimates the current volume of traffic on the by-pass if it were opened today. Next, traffic growth due to increased population and vehicles is accounted for. Fina11y, generated area traffic and location/development traffic is included. This study is being conducted for the proposed by-pass alternate C. This highway will run South of US 30 for about four miles (2.5 miles West, 1.5 miles East of highway 14). The access to the by-pass will be controlled. These entrances wi11 be at grade. These facts wi11 be kept in mind when estimating usage, generation, etc.