---
title: "Overhead Electric Cables Sign Meaning | UK Road Signs"
url: https://fasttrackdrivinglessons.co.uk/theory/road-signs/overhead-electric-cables
description: "Learn the meaning of the overhead electric cables sign, maximum safe height limits, and UK theory test tips."
lang: en
---

# Overhead electric cables — UK road sign

Warns drivers of high-voltage overhead power cables and safe clearance heights ahead.

Image: Overhead electric cables — red, white and black triangle UK road sign (https://fasttrackdrivinglessons.co.uk/signs/overhead-electric-cables.svg)

The 'overhead electric cables' sign alerts drivers, particularly those driving tall vehicles, to high-voltage power lines crossing above the carriageway.

It is usually accompanied by a plate showing the safe height clearance limit to prevent accidental arcing or contact with power lines.

## What this sign means

The sign displays a lightning flash symbol inside a red warning triangle, usually paired with a height restriction plate below.

It warns that high-voltage power lines span overhead and present an electrocution risk to oversized loads, cranes, and tall vehicles.

- Red warning triangle containing a electric bolt symbol
- Usually specifies maximum safe clearance height
- Found near railway power lines or grid crossovers

## What to do when you see it

If you are driving a tall vehicle, ensure your total vehicle height is strictly below the indicated clearance limit before proceeding.

- Check overall vehicle height against the clearance plate
- Divert via an alternative route if your load is too high
- Never extend equipment like crane booms under cables

## How this sign is tested

Questions cover the purpose of clearance indicators and hazards associated with high-voltage electrical overheads.

- Understanding height clearance warning signs
- Identifying hazards specific to tall vehicles and agricultural plant
- Interpreting supplementary height plates

## Common mistakes

Assuming standard passenger cars are affected by height limits, or failing to know the exact physical height of a large load.

## Test yourself on this one

Road and traffic signs is the biggest category in the question bank with 102 questions, and signs turn up inside other categories too. Work through them free, no sign-up needed.

Practise road sign questions (https://fasttrackdrivinglessons.co.uk/theory/practice)

## Frequently asked questions

Does this sign apply to standard cars?

Standard cars pass safely under overhead lines. The warning primarily targets high-sided vehicles, trucks, and farm equipment.

What does the height figure on the plate mean?

It indicates the maximum safe height of a vehicle that can pass under the power cables without risk.

Why can high voltage jump to a vehicle without touching it?

Electricity can arc through the air across short distances if a vehicle comes within the safety clearance gap.

## Passed your theory? Get the practical booked

Your theory certificate lasts two years. Most learners who use it quickly do it with an intensive course — a block of hours with a DVSA approved instructor and a practical test at the end, instead of one lesson a week for months.

Intensive course prices: https://fasttrackdrivinglessons.co.uk/pricing
All courses: https://fasttrackdrivinglessons.co.uk/courses
Crash courses: https://fasttrackdrivinglessons.co.uk/crash-courses
Automatic lessons: https://fasttrackdrivinglessons.co.uk/driving-lessons/automatic
Areas we cover: https://fasttrackdrivinglessons.co.uk/driving-lessons-in
Driving test centres: https://fasttrackdrivinglessons.co.uk/driving-test-centres
How it works: https://fasttrackdrivinglessons.co.uk/how-it-works
Test pass guarantee: https://fasttrackdrivinglessons.co.uk/test-pass-guarantee

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