1 · Warn first
The driver must see the warning before the works. A sign ahead of the site, and a warning lamp for the night. Warning distance follows speed: on a 90 km/h road, 50 metres is not enough.

You need to close a lane, fence the excavation and warn the driver before the works. The order is: warn first, then guide, and fence last.
The driver must see the warning before the works. A sign ahead of the site, and a warning lamp for the night. Warning distance follows speed: on a 90 km/h road, 50 metres is not enough.
Moving traffic into the open lane is the job of cones and channelizers. Cones go out fast but blow over; for a longer closure a channelizer or barrier is the better answer.
The excavation and plant area must be physically closed. Water-filled barriers ship empty and fill on site; barricades suffice for lighter work.
The most common mistake is choosing the right equipment and spacing it wrongly.
Cone spacing follows speed; spaced too far apart, the run reads as a line of obstacles rather than a lane, and drivers thread between them.
The second common mistake is placing the warning sign right beside the works. A driver needs distance to slow down, so the sign stands at a distance calculated from the speed limit.
The third is leaving the crew unprotected while setting out: the layout starts at the approach, not at the work area.
With these three, the price and loading plan come in the first reply; without them we have to ask first.
Quantity, destination country and your specification if you have one. A technical answer on I am setting up road works comes back the same day; pricing is prepared by a person, never auto-generated.