Traffic Management Plan for GPR Survey on Live Roads

What is a traffic management plan for a GPR survey?

A traffic management plan is the written method that keeps road users and the survey crew apart while the crew scans a live road. In India the reference is IRC:SP:55-2014, the Indian Roads Congress "Guidelines on Traffic Management in Work Zones". It requires traffic control planning before any work zone is occupied, even for minor works. The contractor must also obtain permission from the road or traffic authority and the local police first.

Ground penetrating radar is a geophysical method that images underground utilities from the surface, so the crew works on the carriageway itself. A cart at walking pace in a 60 km/h lane is the hazard a work-zone layout exists to manage.

Why is a GPR survey a special case on live roads?

The crew moves continuously, crosses the road at right angles every few metres and often finishes a section within hours. In short, a traffic management plan road survey teams can follow must handle three patterns of work:

• Lines along a lane or verge: mobile works under IRC:SP:55, with a shadow vehicle behind the crew on fast roads.
• Lines across the carriageway: each crossing needs every lane, so closures go one lane at a time.
• Junction grids: an hour or more in one place, which makes a short-term stationary closure.

Footpath scanning brings pedestrians into the plan, and diverting them into the carriageway without protection is the most dangerous shortcut.

What does IRC:SP:55 say about work zones?

It divides every work zone into advance warning, approach transition, activity area with buffer, terminal transition and end-of-works zones, and it sizes signs and tapers by operating speed. Short-term works keep devices in place for under 24 hours, mostly in daylight, with night work allowed under adequate floodlighting. Taper lengths come from its Table 4.1 for speed bands from 50 km/h to 120 km/h.

Warning signs are 600 mm on roads up to 50 km/h and 750 mm for 51–65 km/h. They grow to 900 mm for 66–80 km/h and 1,200 mm above 80 km/h. Minimum clear visibility is 45, 60, 60 and 90 m respectively. A flagman with stop/go boards controls one-lane two-way flow, and Part 6 of the US Manual on Uniform Traffic Control Devices uses a similar zone structure.

What goes into the plan? (at a glance)

A full 3D grid keeps the crew at one junction longer than single lines. Scan layout and closure plan are decided together; there is more on 3D GPR vs 2D GPR in our method note.

How are lane closures planned for cross-road scanning?

One lane at a time, in short closures timed to the traffic, with each scan line completed in pieces and joined in processing.

1. Walk the route with the road owner and mark crossing positions on the sketch.
2. Group crossings so each closure covers several, which cuts set-ups.
3. Close the near lane, scan its share of each crossing, reopen, and move to the next lane, tying every piece to fixed marks so the joins match.
4. Repeat for the other carriageway and median, then clear every cone and tin before leaving.

Careful joins keep split lines sound, though depth across them is only as consistent as the velocity calibration on each piece, which our GPR depth accuracy guide describes.

Which equipment and crew roles does the plan need?

Enough devices for the fastest road on the route, and enough people that nobody scanning also watches traffic.

• Supervisor: holds the permission letter, sets out the layout and can stop work at any moment.
• Flagmen: one at each end of a one-way section, with stop/go boards and radios.
• Devices and protection: speed-sized signs, cones at taper spacing, barricades, night lights and high-visibility clothing for everyone.
• Shadow vehicle: a lit arrow board behind mobile work on high-speed roads.

Mezux Touch holds ISO 45001 certification for safety management, and the plan is briefed to the whole crew before the first cone goes down. On civil engineering and construction projects with several contractors, one shared plan helps reduce risks for everyone on the road.

Highways and expressways need more

Above 80 km/h, signs move to the 1,200 mm size, tapers lengthen and a shadow vehicle becomes essential in a running lane. The plan goes to the project office or concessionaire, who may fix the hours. High-speed crossings are grouped into few closures, or scanned from the median and both shoulders with the alignment between them graded at a lower quality level.

How does traffic management affect the data and the programme?

Closures slow production and leave gaps, and the drawing should show both honestly. Parked vehicles, bus stops and market stalls block lines, and some authorities allow only night work. Unscanned sections appear as gaps, never filled from existing records. A short re-closure for a doubtful crossing costs less than the accidental utility strikes and service disruptions that a guess invites. Partly blocked lines are shown in our pages; read more on GPR Radargram Library examples. Each line is then graded as explained in SUE survey explained simply.

What does a road GPR survey cost?

GPR scanning on live roads is charged at ₹24 per metre for a standard drawing and ₹32 per metre with an L-section, GST extra. Minimum orders are ₹50,000 in Delhi NCR and ₹1,00,000 elsewhere. Long corridors get a whole-order reduction of 25% past 100 km, 40% past 500 km and 50% past 1,000 km. Our NCR crew can be on the road the same day or within 1 working day. Beyond NCR, a colleague who lives in the city takes over, at once or within one working day, and the quote lists mobilisation or travel if any applies. Night working, barricading or flagmen required by an authority are agreed in the written quotation. To start, plan a survey with us and send the road names and any permission conditions.

Sources

1. Indian Roads Congress, IRC:SP:55-2014 “Guidelines on Traffic Management in Work Zones” (First Revision), public copy. law.resource.org
2. US Federal Highway Administration, Manual on Uniform Traffic Control Devices, 11th Edition, Part 6 “Temporary Traffic Control”. mutcd.fhwa.dot.gov

Frequently asked questions

Is a traffic management plan needed for a one-day GPR survey?

Yes, IRC:SP:55 asks for traffic control planning before any work zone is occupied, including short and minor works. For a one-day job the plan can be brief and based on standard layouts.

Who approves the traffic management plan?

The road-owning authority, and the local traffic police where traffic is affected. Site-specific layouts need the road authority’s agreement.

Can GPR survey be done at night in Delhi NCR?

Often, and on some busy roads night work is the condition of permission. Adequate floodlighting and lit devices are then part of the plan.

How long does a lane stay closed for a cross-road scan?

A few minutes per crossing. Grouping several crossings into one closure keeps the total disruption low.

Does a footpath scan need traffic management?

Yes, for pedestrians, since a protected walkway or a short diversion keeps people out of the carriageway.

Where are terms like taper and buffer zone defined?

Short definitions are on our glossary page; see GPR, SUE & Land Survey Glossary for these and other survey terms.

Written by Saniya Parveen · Technically reviewed by Rahul Rai · Updated 8 November 2026