If My Keys Are in My Pocket at a Motorway Charger, Am I ‘In Charge’?

The rise of electric vehicles has introduced new scenarios on UK roads, especially around motorway services and charging points. One common question is: if my keys are in my pocket at a motorway charger, am I legally ‘in charge’ of the vehicle? This is crucial because being ‘in charge’ can lead to serious offences under the Road Traffic Act, even if you haven’t driven anywhere.

In this post, I’ll clarify the offence of being ‘in charge’, explain how key possession at a motorway services forecourt fits into the “in charge” factual test, and cover important nuances like THC blood limits, impairment vs legal limits, and police testing procedures. You’ll also see why EV charging downtime is a risk window for drivers, backed by expert sources such as EV Powered, NHS England, and the General Medical Council (GMC).

The Legal Definition of Being ‘In Charge’ of a Vehicle

Before we discuss motorway chargers, let’s define the legal offence. Under Section 4 of the Road Traffic Act 1988, being ‘in charge’ of a motor vehicle while unfit through drink or drugs is a criminal offence. It covers situations where you may not have driven but still had control or custody of the vehicle.

The prosecution must prove:

You were in charge of the vehicle;
You were unfit through drink or drugs, or above prescribed THC blood limits;
That the vehicle was on a road, or other public place.

What Does ‘In Charge’ Mean? The Factual Test

The key phrase here is 'in charge.' Courts apply a factual test: were you in a position to exercise physical control over the vehicle? This covers a range of real-world scenarios from sitting in the driver’s seat with keys in your hand, to even just holding the keys while near the vehicle.

Being ‘in charge’ isn’t limited to driving. For example, sitting in a parked car with the engine off but keys in ignition can count. But what about standing outside at a motorway services forecourt with keys in your pocket?

Keys in Possession at a Motorway Services Forecourt: Am I ‘In Charge’?

Imagine this: you pull into an EV Powered motorway charger to top up your electric car. You step out, keys in your pocket, maybe even walk a few metres away. Are you in charge at this point?

The answer is: likely yes.

Why? The factual test focuses on whether you had the ability to move or control the vehicle. If your keys are readily accessible — for example, in your pocket — and you are near the vehicle on the motorway services forecourt, the courts can find you to be ‘in charge’. This applies even if the car is stationary and you are physically outside it.

Cases often hinge on proximity and control. Being steps away from your car with your keys means you could move the vehicle immediately, which satisfies ‘in charge’ criteria.

Charging Downtime is a Legal Risk Window

EV charging downtime can last 10–30 minutes or more. This period, while you might think you’re ‘off duty’, is a potential legal risk window. The car is not “switched off” from your control if you have keys and are at the forecourt.

EV Powered’s own guidance for drivers recommends staying by your vehicle during charging precisely because of legal risks and safety. It’s not just consumer advice—it’s a reminder that possession of keys and proximity amount to control in law.

THC Blood Limit vs Impairment: What’s the Real Issue?

Driving offences involving cannabis and THC (tetrahydrocannabinol) are particularly tricky.

THC blood limits were introduced in UK law with strict cut-offs, meaning a driver can be guilty even if not impaired physically.
This differs from alcohol, where impairment is the crux; with cannabis, the law sets a numeric limit to avoid arguments about fitness.

This means you can be ‘in charge’ of a vehicle at a motorway services forecourt, with keys in pocket, and be over the legal THC blood limit—even if you don’t feel impaired. The test is objective: your blood THC level at the time counts.

NHS England highlights that THC can linger in the bloodstream for hours or even days post-consumption, creating risk for unsuspecting drivers.

Statutory Medical Defence and the Burden of Proof

There is a statutory medical defence for certain prescribed drugs, as outlined by the General Medical Council (GMC) guidelines. If you have a prescription for medication that may affect fitness to drive but you took it correctly and were not impaired, you can argue this defence.

However:

You must tell the police about relevant prescriptions;
You must provide evidence you took medication as prescribed;
The burden of proof partly rests on you to show your fitness to drive was unaffected.

Simply having a prescription is not a free pass—particularly in cannabis/THC situations where recreational use and prescribed use may overlap.

Roadside Swab Test vs Police Station Blood Test

If suspected of drugs driving at a motorway charger, police now often use a roadside swab test to detect drug presence quickly.

This test:

Detects traces of controlled drugs in saliva;
Is an initial screening, not conclusive;
Can lead to arrest and mandatory blood testing at police station.

The police station blood test is more accurate and used to establish precise THC blood levels for the prosecution.

Failing the roadside swab can lead to arrest, but it is the blood test that usually provides the actual evidence for court cases.

Summary Table: Factors Influencing ‘In Charge’ at Motorway Chargers

Factor Explanation Impact on ‘In Charge’ Status Keys in possession (pocket/hand) Keys readily accessible for vehicle use High – shows control potential Proximity to vehicle at forecourt Close enough to move vehicle immediately High – satisfies factual test Vehicle engine off, not running Car stationary, charging, no engine noise Low to medium – engine state less relevant THC blood limit exceeded Blood THC above legal limit per Road Traffic Act High – strict liability offence Prescription and medical defence Valid prescription with evidence Possible exemption, but burden on driver

Final Advice: Best Practice to Avoid Risk at Motorway Chargers

Keep keys out of immediate possession if you intend not to be ‘in charge’. For example, leave keys with a passenger or locked away if you plan to leave the forecourt.
Remain near your vehicle when charging, especially on motorway services forecourts, to avoid legal ambiguity.
Know your medical status and prescriptions—if taking medicines covered by GMC guidance, carry proof and be prepared to declare them.
Avoid driving or being ‘in charge’ of a vehicle when over any drug limits. THC limits are zero tolerance in practical terms owing to prolonged detectability.
Understand police testing procedures: a roadside swab could lead to a station blood test, the latter is what matters for prosecution.

In summary, keys in your pocket at a unlimited fine drug driving motorway charger almost certainly mean you are ‘in charge.’ Combined with modern drug limits, this presents legal risks that drivers must manage carefully. Always follow advice from EV Powered and official bodies like NHS England and the GMC to stay on the right side of the law.