Home > Basic Signals > Exploration > Case Study 6

# navigate to...

Case Study 1

Case Study 2

Case Study 3

Case Study 4

Case Study 5

### Modeling an Intersection Using Hardware in the Loop Simulations (HILS)

In this case study you will be given the geometry and traffic counts from the intersection of 3rd and Jackson in Moscow, ID. Using this data, you will construct a model of this intersection in TSIS, determine the optimal signal timing plan, run the model using real time simulation, and view the results in TRAFVU.  This is essentially what was done in the previous case studies, except you will be making the simulation file in TSIS.

In order to familiarize you with TSIS and the modeling process therein, the following link will lead you to a training module.  For some initial background information about Hardware in the Loop Simulations, visit the HILS page.

TSIS Module 1

After you have created the input file, all of the other steps are the same as the previous case studies

# Givens

The geometry of the intersection is as follows:

Hint: To ensure the geometry turns out properly in TSIS, place a node where the WB lanes merge so that there will be two lanes on one side and one lane on the other.

 Movement SBLT SBTH SBRT EBTH EBRT WBLT WBTH Volume (vph) 113 610 148 523 443 105 448 Heavy Vehicles 3% 1% 2%
 Desired v/c Ratio ((v/c)c) .85 Headway (h) 2 sec Peak Hour Factor .89 Lost Time per phase (tL) 3 sec Pedestrian Volumes 50 per hour

The current signal timing plan is as follows, with 3 seconds of yellow and 1 second of all-red (note that if you include the inter-green time, the ring times are equal):

Your task, after you have created the TSIS input file, is to simulate the existing signal timing plan using the CID and traffic controller. While that is coming to equilibrium, determine a new, more efficient signal timing plan for this intersection. You may set up the signal plan in any way that you see fit. Here is a help page if you need assistance with the steps involved in calculating signal timing plans. Once you have viewed the operations using the existing plan, you can implement your plan and compare the results.

Continue on to Acutated Signals