Chapter 4.3, Problem 34E

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7th Edition

Stefan Waner + 1 other

ISBN: 9781337274203

Textbook Problem

**Traffic Flow** Officials of the town of Hempstead were planning to make Hempstead Turnpike and the surrounding streets into one-way streets to prepare for the opening of Hofstra USA. In an experiment, they restricted traffic flow along the streets near Hofstra as shown in the diagram. The numbers show traffic flow per minute and the arrows indicate the direction of traffic.

**a.** Set up and solve the associated traffic flow problem with the following unknowns:

Traffic per minute along the middle stretch of Oak St.

Traffic per minute along the middle stretch of Hempstead Tpk.

Traffic per minute along Einstein Ave.

Traffic per minute along Party Drive.

**b.** If 20 cars per minute drive along Party Drive, what is the traffic like along the middle stretch of Oak Street?

**c.** If 20 vehicles per minute drive along Einstein Ave. and 90 vehicles per minute drive down the middle stretch of Hempstead Tpk., how many cars per minute drive along the middle stretch of Oak Street?

**d.** If Einstein Avenue is deserted, what is the minimum traffic along the middle stretch of Hempstead Tpk.?

**(a)**

To determine

**To calculate:** The traffic flow across the given experiment done by restricting the flow along the streets as shown in the provided diagram.

Explanation

**Given Information:**

The flow along the streets is as shown in diagram.

The unknowns are:

*x* is the traffic per minute along the middle stretch of oak St.

*y* is the traffic per minute along the middle stretch of Hempstead Tpk.

*z* is the traffic per minute along Einstein Ave.

*u* is the traffic per minute along Party drive.

**Formula Used:**

Elementary row operations

Type 1: Replace row

Type 2: Replace row

Gauss Jordan reduction method:

Step 1: Using type 1 operations, clear the fractions or decimals, if any.

Step 2: Select the first non-zero element of the first row as pivot.

Step 3: Using type 2 operations, use the pivot to clear its column.

Step 4: Select the first non-zero element in the second row as a pivot and clear its column.

Step 5: Turn all the selected pivot elements into a 1 using operations of type 1.

**Calculation:**

Consider the provided information,

*x* is the traffic per minute along the middle stretch of oak St.

*y* is the traffic per minute along the middle stretch of Hempstead Tpk.

*z* is the traffic per minute along Einstein Ave.

*u* is the traffic per minute along Party drive.

Equate the traffic in and traffic out at each intersection:

At intersection A

At intersection B

At intersection C

Consider the system of equation,

The augmented matrix for the given system of equations is,

Apply Gauss Jordan reduction method to get the solution of the given system of equation

**(b)**

To determine

**To calculate:** the traffic like along the middle stretch of ok street if 20 cars per minute drive along party drive when the flow across the given experiment done by restricting the flow along the streets as shown in the provided diagram.

**(c)**

To determine

**To calculate:** the traffic like along the middle stretch of oak street if 20 cars per minute drive along Einstein ave and 90 cars per minute drive down the middle stretch of Hempstead Tpk.

The flow across the given experiment done by restricting the flow along the streets as shown in the provided diagram.

**(d)**

To determine

**To calculate:** The minimum traffic along the middle stretch of Hempstead Tpk, if Einstein ave is deserted.

The flow across the given experiment done by restricting the flow along the streets as shown in the provided diagram.

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