Traffic Engineer: Synchro & Corridor Modeling

Parsons; Riyadh; On-site; SAR 179,000 - 257,000; Full time

Job summary

Parsons Corporation seeks an experienced Traffic Engineer specializing in Synchro and SimTraffic modeling in Riyadh. The role focuses on converting field data, geometry, and timing into dependable models to guide corridor optimization and signal timing improvements across Riyadh.

Ideal candidates have at least 4 years of traffic engineering experience, strong model calibration skills, and familiarity with Saudi or GCC urban networks.

Qualifications

• Bachelor's degree in Civil Engineering, Transportation Engineering, Traffic Engineering, or closely related discipline.
• Minimum 4 years of traffic engineering experience with substantial practical use of Synchro and SimTraffic.
• Proven ability to build, calibrate, validate, and apply intersection and corridor models using real traffic data.
• Strong understanding of signalized intersection operations, phasing, coordination, saturation flow, queues, delay, and capacity.
• Experience evaluating both traffic signal and geometric improvement alternatives.
• Working knowledge of Highway Capacity Manual principles and their application within Synchro.
• Ability to interpret controller timing sheets, turning-movement counts, roadway geometry, and field observations.
• Experience diagnosing congestion using both model outputs and real operating conditions.

Responsibilities

• Develop Synchro models for signalized intersections, unsignalized intersections, and coordinated arterial corridors.
• Build models using approved turning-movement counts, roadway geometry, signal timing information, and verified field conditions.
• Code lane configurations, turning movements, storage lengths, grades, heavy vehicle percentages, pedestrian phases, and other required parameters.
• Review saturation flow assumptions and adjust inputs where field conditions justify calibrated values.
• Enter signal phasing, cycle lengths, splits, offsets, clearance intervals, and coordination settings accurately.
• Calibrate model behavior using observed queues, field saturation conditions, travel times, cycle observations, and operational evidence.
• Validate Synchro and SimTraffic outputs against actual traffic conditions before using models for recommendation development.
• Identify bottlenecks, queue spillback, split failures, poor progression, capacity constraints, and inefficient signal operation.
• Use model results to distinguish isolated intersection problems from broader corridor-level interactions.
• Develop and test alternative timing plans, phasing arrangements, cycle lengths, splits, offsets.
• Evaluate lane-use changes, turn restrictions, channelization, minor geometric modifications.
• Optimize coordinated corridor plans to improve progression and reduce unnecessary delay and stopping.
• Assess queue management strategies where downstream congestion or limited storage affects network performance.
• Compare alternatives using delay, level of service, queue length, stops, travel time, volume-to-capacity ratio, throughput, and progression quality.
• Prepare clear before-and-after summaries showing the expected operational effects of proposed changes.
• Produce technical tables, exhibits, timing sheets, graphics, and concise engineering narratives.
• Coordinate with Traffic Signal Operations Engineers to translate approved model results into field-ready controller timing plans.
• Support development of field test strategies for timing changes recommended through Synchro analysis.
• Review field implementation results and compare observed performance against modeled expectations.
• Support quick-win traffic improvement programs by identifying measures that can be implemented with limited physical modification.
• Contribute to longer-term corridor strategies where modeling indicates more substantial design intervention is required.

Skills

Synchro

SimTraffic

Traffic Engineering

Traffic Operations Modeling

Intersection Analysis

Corridor Analysis

Signal Timing Analysis

Signal Phasing

Cycle Length Optimization

Split Optimization

Offset Optimization

Corridor Coordination

Green-Wave Analysis

Saturation Flow Analysis

Queue Analysis

Delay Analysis

Level of Service

Volume-to-Capacity Analysis

Throughput Analysis

Travel Time Analysis

Turning-Movement Counts

Model Calibration

Model Validation

Sensitivity Testing

Microsoft Excel

Education

Bachelor's degree in Civil Engineering, Transportation Engineering, Traffic Engineering, or closely related discipline

Tools

Vissim

HCS

SIDRA

ArcGIS

ATSPM

Job description

Parsons Corporation seeks an experienced Traffic Engineer specializing in Synchro and SimTraffic modeling in Riyadh. The role focuses on converting field data, geometry, and timing into dependable models to guide corridor optimization and signal timing improvements across Riyadh.

Ideal candidates have at least 4 years of traffic engineering experience, strong model calibration skills, and familiarity with Saudi or GCC urban networks.