Which sequence describes the correct order of placing devices?

• A. Place signs, then detours.
• B. Place all devices randomly.
• C. Begin with cones near the site.
• D. Start with advance warning signs and work down to the work site.

Answer: (D)

The essential idea is to set up traffic control from upstream to downstream, giving drivers warning well before they reach the work area. Starting with advance warning signs allows motorists to slow down and prepare for changes in traffic patterns early. As you move closer to the site, you place the channelizing devices and barriers to physically guide traffic away from the work zone and form a safe, visible path. If detours are needed, they’re integrated into that same upstream-to-downstream sequence so drivers know how to navigate ahead of time. Beginning with cones near the site offers no early warning, and placing devices randomly creates confusion and unsafe conditions.