Traffic Control AHA (Activity Hazard Analysis / Job Hazard Analysis)

Updated 2026-06-23

A Traffic Control AHA (Activity Hazard Analysis / Job Hazard Analysis) is the plan that keeps the traffic-control crew safe from flagger and worker struck-by exposure, during device setup and removal in traffic, and through an adequate traffic-control plan. Traffic control sets up and manages the work-zone traffic control that guides traffic through and around construction — combining the flagger-and-worker-exposure and struck-by hazard, the device-setup-and-removal and in-traffic hazard, and the traffic-control-plan-adequacy hazard. This guide walks through building a Traffic Control AHA that names the flagger-and-worker-exposure/struck-by, device-setup-and- removal/in-traffic, and traffic-control-plan-adequacy hazards and assigns the flagger, device, and plan controls that hold up in the field.

Why traffic control needs its own AHA

Traffic control sets up, operates, and removes the temporary traffic control for a work zone — the signs, channelizing devices, barriers, flaggers, and traffic-control plan that guide, warn, and route traffic (public and site) through and around the construction work zone, protecting both the traveling public and the workers. The defining feature is that traffic-control workers, especially flaggers, work directly exposed to live traffic, making the struck-by hazard the primary concern. The hazards combine the flagger-and-worker-exposure and struck-by (flaggers and traffic-control workers work directly in or beside live traffic — the struck-by hazard from the traffic they are controlling, the leading cause of traffic-control worker injuries and deaths), the device-setup-and-removal and in-traffic (setting up and removing the traffic-control devices (signs, cones, barriers) is done in or adjacent to live traffic — the exposure during setup/removal, when the protection is not yet or no longer fully in place), the traffic-control-plan-adequacy (the traffic-control plan (TCP) is the safety design — an inadequate or improperly implemented TCP fails to protect the workers and public (a safety function)), and the visibility/night. The flagger-and-worker-exposure/struck-by and the device-setup-and- removal/in-traffic justify a dedicated AHA.

Breaking traffic control into steps

The steps for a Traffic Control AHA follow the traffic control:

• Develop/review the traffic-control plan (TCP)
• Set up the traffic-control devices (in traffic)
• Position flaggers safely (escape routes, PPE)
• Operate the traffic control (flagging, monitoring)
• Maintain the traffic control
• Remove the devices safely (in traffic)
• Manage the exposure, setup, and plan hazards
• Complete

Each step carries a hazard, and the flagger-and-worker-exposure/struck-by, the device-setup-and-removal/in- traffic, and the traffic-control-plan-adequacy are where the most significant risks concentrate.

The hazards step by step

Flagger-and-worker-exposure and struck-by

Flaggers and traffic-control workers work directly in or beside live traffic — the struck-by hazard from the traffic they are controlling, the leading cause of traffic-control worker injuries and deaths. The controls are high-visibility apparel (ANSI-compliant), positioning flaggers safely (with an escape route, out of the traffic path where possible, good sight distance), proper flagging procedures (paddles, signals), buffer space, reduced traffic speed through the zone, and the flagger-exposure controls. The flagger-and-worker-exposure/struck-by is the primary defining hazard — flaggers are directly exposed to traffic. (These follow the flagger-safety fundamentals.)

Device-setup-and-removal and in-traffic

Setting up and removing the traffic-control devices (signs, cones, barriers) is done in or adjacent to live traffic — the exposure during setup/removal, when the protection is not yet or no longer fully in place. The controls are safe setup/removal procedures (setting up in the direction of/against traffic per procedure, high- visibility, a shadow/protection vehicle where warranted), minimizing exposure time, and the setup/removal controls. The device-setup-and-removal/in-traffic is a defining hazard — setup/removal exposure before/after full protection. (These follow the work-zone-setup fundamentals.)

Traffic-control-plan-adequacy

The traffic-control plan (TCP) is the safety design — an inadequate or improperly implemented TCP fails to protect the workers and public (a safety function). The controls are an adequate, standards-compliant TCP (per the MUTCD — proper advance warning, transitions/tapers, buffer, device spacing), correctly implementing the TCP in the field, adjusting for conditions, and the plan controls. The traffic-control-plan-adequacy is a defining safety function — the TCP is the protection design. (These follow the traffic-control-plan fundamentals.)

Visibility/night

The visibility and night (traffic control at night/low visibility) carries the visibility hazard. The controls are lighting, retroreflective devices/apparel, and enhanced visibility measures for night work, and the visibility controls. (These follow the night-work fundamentals.)

A simple Traffic Control AHA structure

Flagger/worker struck-by protection and TCP adequacy

A Traffic Control AHA centers on flagger/worker struck-by protection and TCP adequacy. The flagger/worker struck-by protection addresses the direct exposure to live traffic — controlled by high-visibility apparel, positioning flaggers safely (escape route, out of the traffic path, good sight distance), proper flagging procedures, buffer space, and reduced traffic speed, since flaggers are directly exposed. The TCP adequacy addresses the traffic-control plan as the safety design — controlled by an adequate, standards-compliant TCP (per the MUTCD), correctly implementing it in the field, and adjusting for conditions. And the setup/removal and night work get exposure and visibility controls. An AHA built on flagger/worker struck-by protection and TCP adequacy, with setup and visibility controls, addresses the hazards that define traffic control.

From the field: what actually goes wrong

In fourteen years across federal, heavy civil, and industrial projects, traffic control is the activity whose workers are most directly and continuously exposed to the hazard they are managing — live traffic — so the struck-by hazard is the defining and often fatal concern. The flagger-and-worker-exposure and struck-by hazard is primary: flaggers and traffic-control workers stand and work directly in or beside live traffic to control it, so they face the struck-by hazard from the very traffic they are directing, which is the leading cause of traffic-control worker injuries and deaths. So high-visibility apparel (ANSI-compliant, so drivers see them), positioning flaggers safely (always with an escape route so they can get out of the way of an errant vehicle, out of the traffic path where possible, and with good sight distance so they and drivers see each other), proper flagging procedures, buffer space between the traffic and the workers, and reduced traffic speed through the zone are the controls. The escape route is a specific, critical flagger control — a flagger must always have somewhere to jump when a driver does not stop, because drivers do run through work zones.

The device-setup-and-removal/in-traffic and the traffic-control-plan-adequacy are the other defining hazards. On the projects I have run, setting up and removing the traffic-control devices (signs, cones, barriers) is one of the most dangerous moments, because it is done in or adjacent to live traffic when the protection is not yet fully in place (during setup) or is being taken away (during removal) — so safe setup and removal procedures (setting up in the proper sequence and direction relative to traffic, high-visibility, and a shadow or protection vehicle where warranted) and minimizing exposure time are the controls. The traffic-control-plan adequacy is the underlying safety function: the TCP is the design that protects everyone, so an adequate, standards-compliant TCP (per the MUTCD, with proper advance warning, transitions and tapers, buffer space, and device spacing) correctly implemented in the field is what makes the whole work zone safe — an inadequate or poorly implemented TCP fails to protect the workers and the public. The night and low-visibility work rounds it out. The AHA built on flagger/worker struck-by protection and TCP adequacy is the one that protects the traffic-control crew and the traveling public.

The bottom line

A Traffic Control AHA names the flagger-and-worker-exposure/struck-by, the device-setup-and-removal/in-traffic, and the traffic-control-plan-adequacy hazards with specific controls — high-visibility apparel with safe flagger positioning and escape routes (flaggers are directly exposed and struck-by is the leading cause of their injuries), safe device setup/removal minimizing exposure, and an adequate standards-compliant TCP correctly implemented. The flagger struck-by protection and the TCP adequacy are the defining concerns. The AHA that manages both is the one that protects the crew and the public.

Frequently asked questions

Why is the struck-by hazard the primary concern in traffic control?

Flaggers and traffic-control workers stand and work directly in or beside live traffic to control it, so they face the struck-by hazard from the very traffic they are directing — the leading cause of traffic-control worker injuries and deaths. Controls are high-visibility apparel (ANSI-compliant), positioning flaggers safely (with an escape route, out of the traffic path where possible, good sight distance), proper flagging procedures, buffer space, reduced traffic speed through the zone, and the flagger-exposure controls.

Why is an escape route critical for flaggers?

A flagger must always have somewhere to move when a driver does not stop, because drivers do run through work zones — the escape route is what lets the flagger get out of the way of an errant vehicle. Controls are positioning flaggers with an escape route, out of the traffic path where possible, with good sight distance, high-visibility apparel, buffer space, and the flagger-safety controls.

Why is device setup and removal especially dangerous?

Setting up and removing the traffic-control devices (signs, cones, barriers) is done in or adjacent to live traffic when the protection is not yet fully in place (setup) or is being taken away (removal) — one of the most dangerous moments in traffic control. Controls are safe setup/removal procedures (proper sequence and direction relative to traffic, high-visibility, a shadow/protection vehicle where warranted), minimizing exposure time, and the setup/removal controls.

What is traffic control?

Traffic control sets up, operates, and removes the temporary traffic control for a work zone — the signs, channelizing devices, barriers, flaggers, and traffic-control plan that guide, warn, and route traffic (public and site) through and around the construction work zone. Because traffic-control workers (especially flaggers) work directly exposed to live traffic, the flagger-exposure, device-setup, and TCP-adequacy hazards apply.

Related AHAs and JHAs

• Temporary Barriers and Enclosures AHA — the barriers used in traffic control
• Traffic Control and Work Zone Safety JHA — the work-zone traffic-control fundamentals
• Temporary Runarounds AHA — the detour routes traffic control manages
• Temporary Roads AHA — the roads traffic control protects

Written by Mustafa Tok, CSP, ASP, CHST — OSHA Authorized Outreach Trainer with 14+ years of international construction safety experience across federal, heavy civil, and industrial projects.