Your Problem is Our Priority!
Keeping Workers, Drivers & Pedestrians Safe
Full-service traffic control across Louisiana, Mississippi & Texas — on time, on budget, and people-first.
Our Services
What We Do
From a single flagger to a full project setup — we supply and manage the equipment your job demands.
Traffic Flagging
Certified flaggers keeping traffic moving safely through your work zone. We show up on time, every time.
Temporary Road Signs
Full supply and placement of compliant temporary signage — warning signs, speed reductions, and directional markers.
Road Closures & Lane Control
Complete road closure management and lane control setups for construction, utility work, and emergency response.
Equipment Supply & Management
Cones, barrels, barricades, arrow boards, and more — sourced, delivered, and managed for your project timeline.
24/7 Emergency Callouts
When the unexpected happens, we respond. Emergency traffic control available around the clock, any day of the year.
Directly Provided Law Enforcement
Off-duty enforcement officers supplied directly by STC for high-risk zones, intersections, and projects requiring a sworn presence.
Project Support Services
End-to-End Project Support
We don't just show up with equipment — we manage the entire traffic control operation from first permit to final cone pickup.
Traffic Control Planning
Custom traffic control plans drawn to MUTCD standards for any project size — from utility cuts to major highway work.
Permitting Assistance
We navigate the permit process with you, coordinating with local agencies and DOTs so your project stays on schedule.
Equipment Setup & Management
Full deployment, maintenance, and breakdown of all traffic control devices — properly placed, inspected, and compliant.
On-Site Management
Experienced supervisors on the ground to oversee operations, adapt to changing conditions, and keep your crew protected.
Off-Duty Law Enforcement
We directly provide off-duty law enforcement officers for high-risk zones, intersections, and projects requiring a sworn presence.
Why Sonnier
We Show Up
24/7 availability — emergency callouts, early mornings, and everything in between. When you need us, we're there.
We Ensure a Safe Environment
Every worker, driver, and pedestrian matters. Our setups are built to protect people — not just check a box.
We Make It Simple
We help you keep things on time, on budget, without unnecessary surprises. Have a problem? Let us help you make the job easier.
Coverage Area
Serving the Gulf South
Licensed and operating across three states, serving public agencies, contractors, and private sector clients.