VISSIM
VISSIM is a specialized computer program that traffic engineers use to simulate and analyze how vehicles, pedestrians, and public transit move through cities and highways. Think of it as a virtual testing ground where engineers can test different traffic solutions before implementing them in real life. It helps predict how changes like new traffic lights, road designs, or bus lanes might affect traffic flow. This tool is particularly valuable when planning new roads, improving existing intersections, or managing large events that impact traffic. Similar programs include Aimsun and CORSIM, which are all part of what's called "traffic microsimulation software."
Examples in Resumes
Conducted traffic analysis using VISSIM to optimize intersection performance
Created VISSIM models for a major highway expansion project
Led team in developing VISSIM simulations for citywide transit improvements
Typical job title: "Traffic Engineers"
Also try searching for:
Where to Find Traffic Engineers
Professional Organizations
Professional Networks
Example Interview Questions
Senior Level Questions
Q: How would you approach calibrating a VISSIM model for a complex urban intersection?
Expected Answer: A senior engineer should explain the process of gathering real traffic data, adjusting simulation parameters to match real conditions, and validating the model against actual traffic patterns. They should mention the importance of considering multiple peak periods and seasonal variations.
Q: How do you determine if a VISSIM simulation is reliable for decision-making?
Expected Answer: The answer should cover statistical validation methods, the importance of multiple simulation runs, and how to interpret confidence levels in the results. They should also mention the need to verify inputs and calibration data.
Mid Level Questions
Q: What key parameters do you adjust when modeling traffic behavior in VISSIM?
Expected Answer: Should discuss driver behavior settings, vehicle characteristics, speed distributions, and routing decisions. Should explain how these affect simulation accuracy.
Q: How do you model pedestrian interactions with vehicles in VISSIM?
Expected Answer: Should explain pedestrian modeling features, crossing behaviors, signal timing integration, and how to ensure realistic interaction between pedestrians and vehicles.
Junior Level Questions
Q: What basic data do you need to start building a VISSIM model?
Expected Answer: Should mention traffic counts, road geometry, signal timing plans, and vehicle composition data as minimum requirements for basic modeling.
Q: How do you create a basic corridor model in VISSIM?
Expected Answer: Should be able to explain the basic steps of creating links and connectors, setting up basic vehicle inputs, and implementing simple signal controls.
Experience Level Indicators
Junior (0-2 years)
- Basic traffic model creation
- Simple intersection analysis
- Data collection and input
- Basic result interpretation
Mid (2-5 years)
- Complex intersection modeling
- Signal timing optimization
- Multiple scenario analysis
- Model calibration
Senior (5+ years)
- Large-scale network modeling
- Advanced calibration techniques
- Project management
- Technical team leadership
Red Flags to Watch For
- No understanding of basic traffic flow concepts
- Lack of experience with traffic data collection
- Unable to explain model calibration process
- No knowledge of other traffic analysis tools
Related Terms
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