Studies were conducted at two sits on rural roads with similar characteristics. The first site was 7.5 miles in length with an Annual Average Daily Traffic (AADT) of 7,400. Over the year-long study period, 42 crashes occurred on this portion of roadway, 5 of them resulting in fatalities. The second site was a 14-mile section with an AADT of 4,700. There were 67 crashes in this section with 5 fatalities. Determine the appropriate crash rates for both locations, and discuss the implications.

The average number of collisions on Rt. 116 in South Deerfield is 15 per year. To address the high crash rate, a signal has been installed to make right-of-way explicit. The number of accidents in the following year was 9. MassDOT desires to know with how much confidence this reduction of accidents can be attributed to anything other than random chance.

Determine whether the criteria for installation of multi-way stop control are satisfied for an intersection with a total entering volume of 365 veh/h on the major street approaches, 355 veh/h on the minor street approaches, and 8 crashes within the last 12 months that could be avoided had multi-way stop control been in place. Criterion for major road traffic volume: Yes, this criterion is satisfied. No, this criterion is not satisfied. Criterion for minor road traffic volume: ○ Yes, this criterion is satisfied. No, this criterion is not satisfied. Criterion for crashes: Yes, this criterion is satisfied. No, this criterion is not satisfied. Determine whether the installation of a multi-way stop control is justified. ○ Yes, a multi-way stop control should be installed. O No, a multi-way stop control should not be installed.

An old 6-lane (3 lanes each direction) rural freeway segment has 11 ft lanes and frequent roadside obstructions located 10 ft from the right edge of the pavement. What is the estimated FFS (mph) for the 3 northbound lanes? Provide the answer to the nearest tenths. Response Feedback: The BFFS of 75.4 mph is adjusted by 1.9 mph for the 11 ft lanes.

3. What are the nine crash factors used in the analysis of a crash event?

A freeway traffic stream was observed to have a density of 22.0 veh/mi/ln when the mean speed was 55.0 mi/h. On another occasion at the same location, the jam density was found to be 132 veh/mi/ln. Assume Greenshields' model of traffic flow applies. The optimum speed (in mi/h) is: a) 22.0 b) 33.0 c) 55.0 d) 66.0 e) None of he above