Managing traffic flow during road work, events, or emergencies can pose a real challenge. Fortunately, temporary light signals offer a flexible, visible way to keep vehicles moving safely and smoothly. At Safety Network Inc., we draw on MUTCD guidelines and decades of field experience to help you choose, deploy, and maintain these signals. Below, we explain why they matter, how to set them up, and best practices to ensure they work as intended.
1. Why Temporary Light Signals Matter
First, they provide clear guidance when permanent signals are offline or when traffic patterns change. By using portable traffic lights, you can:
- Reduce Confusion: Drivers see familiar red–yellow–green cues, so they know when to stop and go.
- Maintain Safety: Properly timed signals cut down on rear-end collisions and right-angle crashes.
- Keep Traffic Moving: Instead of flaggers stopping cars for long periods, signals alternate flow in an orderly way.
Moreover, temporary lights let you handle one-way traffic on narrow roads, manage complex intersections during construction, and keep lanes open for emergency vehicles.
2. Types of Temporary Light Signals
Next, consider the main options available:
- Trailer-Mounted Traffic Signals
- Mounted on a towable unit with a solar or battery power source.
- Offer the same red–yellow–green heads as fixed signals.
- Ideal for longer-term projects since they withstand weather and heavy use.
- Portable Pedestal Signals
- Lighter, with collapsible stands.
- Quick to set up and move between sites.
- Best for short-term closures or spot repairs.
- Handheld Stop/Slow Paddles with Lights
- Combine manual flagger control with built-in LED lights.
- Useful when you need human judgment for unusual traffic patterns.
- However, they require trained flaggers and can slow travel more than fixed signals.
Each type serves a distinct purpose. Therefore, choose based on project length, road width, and traffic volume.
3. Setup and Timing Best Practices
Furthermore, proper setup ensures signals work well:
- Placement: Set trailer signals at least 150 ft before the work zone, with advance warning signs preceding them. Then, mirror that distance on the opposite side.
- Signal Timing: For one-lane alternating traffic, use a min–max cycle:
- Minimum green time long enough for a line of cars to clear the zone.
- Maximum green time prevents excessive wait times for the other side.
- Synchronization: When using multiple sets, link them wirelessly or via cable so that only one direction shows green at a time.
- Visibility: Elevate signal heads to six feet above ground, and use high-intensity LEDs so drivers see them even in bright daylight.
By following these steps, you reduce driver frustration and improve overall traffic flow.
4. Power & Maintenance Considerations
Moreover, keeping signals powered and clean is key:
- Solar & Battery Care: Check battery charge levels daily. Clean solar panels weekly to remove dust and debris for optimal charging.
- Wiring & Connections: Inspect cables for wear and secure all plugs against moisture.
- Lens Cleaning: Wipe signal lenses every two days to keep lights bright.
- Backup Power: Always have a spare battery or generator on-site to avoid downtime.
Routine checks let you catch issues before they cause dark signals or flashing failures.
5. Coordination & Communication
In addition, work closely with local agencies and stakeholders:
- Advance Notice: Inform police, fire, and EMS about signal locations and timing so they can plan routes.
- Public Alerts: Use social media, local news, and signage to let drivers know about new signal patterns and expected delays.
- Flagger Backup: Even with signals, have flaggers on hand to guide confused drivers and handle unusual situations.
By coordinating early, you gain buy-in from emergency services and the public, which eases traffic flow.
6. Compliance and Safety Standards
Finally, ensure your signals meet all regulations:
- MUTCD Chapter 4L: Follow the Manual on Uniform Traffic Control Devices for temporary traffic control guidelines.
- Caltrans Specifications: In California, use signals certified to state specs for public roads.
- OSHA Requirements: Keep a safe work zone for flaggers and technicians setting up or moving signals.
Sticking to these standards makes your traffic control plan solid and audit-ready.
Frequently Asked Questions (FAQs)
Q: How long can I run a solar-powered signal before recharging?
A: Most trailer-mounted units operate for 5–7 days on a full charge. However, heavy usage or overcast weather can shorten that time.
Q: Can I use handheld signals instead of trailers on busy roads?
A: Handheld paddles work for low-volume or short-term jobs. For roads over 25 mph or with more than 500 vehicles per hour, trailer signals are safer and more efficient.
Q: Do I need a permit to deploy temporary traffic signals?
A: Yes. Obtain local jurisdiction approval and submit your Traffic Control Plan (TCP) showing signal locations and timing.
Q: How do I set green time for each direction?
A: Calculate the time it takes a vehicle to travel the controlled segment at posted speeds, plus a buffer for reaction time. Then add 5–10 seconds as a safety margin.
Q: What do I do if a signal fails at night?
A: Switch to a flash mode (per MUTCD) and deploy flaggers immediately. Repair or replace the unit as soon as possible.
Conclusion
Temporary light signals play a vital role in managing traffic flow safely and efficiently. By choosing the right signal type, setting proper timing, keeping equipment maintained, and coordinating with local authorities, you can minimize delays and protect both drivers and crews. Safety Network Inc. combines clear expertise, practical guidance, and top-quality equipment to make your traffic control projects a success.