Important$-$ Please submit your work, including essential diagrams and a written memo: summarizing the problem, the processes undertaken, and the results achieved.

Problem #$1$: Safety Prediction

Given:

Sufficient information is shown in Figure $1$ to establish homogeneous segments for the analysis. The following information is needed to compute the expected number of crashes for each segment:

Average Daily Traffic $=4,000$ vehicles per day

Number of Lanes $=2($one per direction$)$

Area Type $=$ Urban$/$Suburban

Lane Width $=11$ feet

Shoulder Width $=4$ feet

Shoulder Type is paved

Driveway Density $=10$ per mile

Roadside hazard rating $=4$

Find:

The expected number of crashes $($one year$)$ along the given roadway.

Problem #$2$: Speed Consistency Analysis

Given:

The horizontal alignment for a two$-$lane urban$/$suburban collector is shown in Figure $1.$ Other, related information is given above in Problem $1.$

Find:

a$.$ Use the passenger car speed prediction models presented in the laboratory to estimate the ${85}^{th}-$percentile operating speed along the alignment, assuming that the posted speed along the alignment is $40$ miles per hour. Plot the speed predicted as a function of the longitudinal distance along the roadway.

b$.$ Determine if the alignment produces good, fair, or poor design consistency between each tangent$-$curve combination, based on the predicted operating speeds

Figure $1.$ Horizontal Alignment