Section 3: Traffic Control
Introduction
Since safety is one of the most important concerns, all required traffic control devices must be in place and installed properly. All traffic control devices should conform to the details shown on the plans or those indicated in the Texas Manual on Uniform Traffic Control Devices (
).
Pre-Positioning
For the operation to begin efficiently, the required barricades
and signs should be in their proper locations no later than the
day before the sealing begins. For strip/spot seal coat work, traffic control
devices are normally placed on the day the work is performed. Generally,
there should be one person who has full responsibility for traffic
control. Traffic control includes erecting signs and barricades,
placing traffic cones, flagging, and moving appropriate traffic
control devices down the roadway as close as possible behind the
seal coat equipment.
Project signing should be completed before beginning any seal
coat work. Signs should be covered until they become effective and
removed when no longer needed.
Displaying Signs
Before any work begins and before any equipment is moved onto
the highway, all of the required traffic control devices must be:
- In the proper sequence
- The correct distance and spacing leading up to the work
- Clearly visible to motorists
- Positioned correctly so the devices do not pose a hazard to traffic.
Traffic Cones
Traffic cones are typically used to keep traffic routed around the seal coat work area as shown in Figure 8‑1. Traffic cone placement must be checked to ensure:
- Sight distance is adequate prior to lane closure
- Proper spacing and taper lengths
- Cones are placed past the distance of the first asphalt shot
- Cones are placed outside the operating path of the asphalt distributor and aggregate spreader.Figure 8-1. Traffic Cones in Position.
Flaggers
When flaggers are required, each flagger must be properly
trained or certified. Ensure the flagger is using proper equipment,
correct signals, and can verbally explain the situation to vehicle
operators. If there are flaggers at both ends of the project, ensure
they have adequate communication devices and that the devices are
used properly. The flaggers are vital to the safety of motorists
in the work area. If the flaggers are not performing their duties
properly, they must be corrected promptly.
Pilot Vehicle
A pilot vehicle and radio equipped flaggers are often used
for undivided roadways to improve the safety of the traveling public
through a seal coat project. As a minimum, a pilot vehicle should
have appropriate signing on the rear of the vehicle to guide the
traveling public through the seal coat project.
Repositioning Traffic Control Devices
As work progresses down the roadway and as sections are opened
to traffic, appropriate traffic control devices and flaggers should
be repositioned. Once the flaggers and appropriate traffic control
devices have been repositioned, they should be checked again to
ensure proper placement and procedures.
Intersections
If the seal coat operation crosses intersections, traffic
in these areas must be controlled. Care must be taken to prevent
vehicles from crossing the asphalt before the aggregate is placed.
This may require positioning other members of the traffic control
crew at the intersection.
Arrow Boards
Arrow boards are often used to move traffic into the adjacent
lane. These are especially used on four-lane highways and where
there is a large volume of high-speed traffic.