A four-lane freeway (two lanes in each direction) is located on rolling terrain and has 12-ft lanes, no lateral obstructions wit
hin 6 ft of the pavement edges, and there are 2 ramps within 3 miles upstream of the segment midpoint and 3 ramps within 3 miles downstream of the segment midpoint. A weekday directional peak-hour volume of 1800 vehicles (familiar users) is observed, with 700 arriving in the most congested 15-min period. If a level of service no worse than C is desired, determine the maximum number of heavy vehicles that can be present in the peak-hour traffic stream.
Consider the freeway and traffic conditions described in Problem 6.3. If 180 of the 1800 vehicles observed in the peak hour were heavy vehicles (assume a 70%/30% SUT/TT split), what would the level of service of this freeway be on a 5-mi, 6% downgrade?
Consider the freeway and traffic conditions described in Problem 6.3. If 180 of the 1800 vehicles observed in the peak hour were heavy vehicles (assume a 70%/30% SUT/TT split), what would the level of service of this freeway be on a 5-mi, 6% downgrade?
1 answer:
Answer:
Check the explanation
Explanation:
FFS = Free-Flow Speed (km/h) BFFS = the Base Free-Flow Speed (km/h) fLS = the Adjustment for lane and shoulder widths less than 3.65 m and 1.80 m, respectively. fAPD = Adjustment for access points density (km/h) fm = Adjustment for proportion (km/h) 3.0 Results
Kindly check the below image for the step by step explanation to the above question.
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Explanation:
Inputs and Outputs:
There are 3 inputs = I₁, I₂, and S
There are 2 outputs = O₁ and O₂
The given problem is solved in three major steps:
Step 1: Construct the Truth Table
Step 2: Obtain the logic equations using Karnaugh map
Step 3: Draw the logic circuit
Step 1: Construct the Truth Table
The given logic is
When S = 0 then O₁ = I₁ and O₂ = I₂
When S = 1 then O₁ = I₂ and O₂ = I₁
I₁ | I₂ | S | O₁ | O₂
0 | 0 | 0 | 0 | 0
0 | 0 | 1 | 0 | 0
0 | 1 | 0 | 0 | 1
0 | 1 | 1 | 1 | 0
1 | 0 | 0 | 1 | 0
1 | 0 | 1 | 0 | 1
1 | 1 | 0 | 1 | 1
1 | 1 | 1 | 1 | 1
Step 2: Obtain the logic equations using Karnaugh map
Please refer to the attached diagram where Karnaugh map is set up.
The minimal SOP representation for output O₁
The minimal SOP representation for output O₂
Step 3: Draw the logic circuit
Please refer to the attached diagram where the circuit has been drawn.
