Afour lane undivided multilane highway (two lanes in each direction) has 11 ft lanes and 5 ft shoulders. at one point along the highway there is a 4% upgrade that is 0.62 mi long. there are 15 access points along this grade. the peak hour traffic volume is 2340 vehicles, with 10% single-unit trucks and 10% tractor-trailer trucks, and 620 of these vehicles arrive in the most congested 15-min period. this traffic stream is primarily commuters (fp=1.0). the posted speed limit is 65 mi/hr. a. calculate the los b. to improve the level of service, the local transportation agency is considering reducing the number of access points by blocking some driveways and rerouting their traffic. how many of the 15 access points must be blocked to achieve los c? b.