civil engineering $,$ course name : Traffic engineering

textbook : Principles of Highway Engineering and Traffic Analysis Fifth Edition Fred L$.$ Mannering Purdue University Scott S$.$ Washburn University of Florida

Q$2$: For the intersection shown in the image which is currently operating using yield sign on

minor approaches, answer the

following questions after carefully reading the data

The following data is applicable for this intersection:

Design vehicle: passenger car

Level terrain, grade$=0\%$

$12$ ft lanes

a$/$g$=0\mathrm{.}35$

Speed on minor approach: $35$ mph

Speed on major approach: $40$ mph

$1$ lane$/$direction for all approaches

The following crashes occurred during $12-$month period:

o $2$ right angle with severe injuries

o $3$ left turn with slight injuries

$4$ rear end crashes

Answer the following questions, and show your calculations when needed:

What level of control should be checked for this intersection $($i$.$e$.$ level I, and$/$or level II$,$

and$/$or level III$)$

Calculate $($dA$-$stop right$)?$

Calculate $($dB$,$ act$-$right$)?$

Calculate $($dB$,$ act$-$left$)?$

Calculate dB$,$min $?$

What level of control is violated?

What level of control should be checked?

What criteria are satisfied under the level of control that should be installed on this

intersection? State and discuss

note : all details are mentioned in the question