Cockpit Drill: The DSSSM Routine
The cockpit drill is the fundamental safety sequence you perform every time you sit in the driver's seat. It ensures you have full, comfortable control of the vehicle before turning the ignition key.
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Knowledge: The Purpose of DSSSM
DSSSM stands for Doors, Seat, Steering, Seat belt, and Mirrors. This sequence guarantees that your car is physically secure, you are seated comfortably with full pedal reach, and your vision covers all essential blind spots before moving.
Understanding: Why Sequence Matters
Adjusting mirrors before your seat is set causes blind spots, while fastening your seat belt before setting the seat restricts your movement. Performing DSSSM in the correct order saves time and ensures consistent driver safety.
Syllabus, Highway Code & Test Requirements
How this lesson aligns with the official national driving standards and practical test assessments in Great Britain.
- Carry out safe pre-drive checks to ensure all doors are shut and the car is roadworthy
- Adjust the driving seat, head restraint, and steering control for optimal posture and complete pedal depression
- Fasten and adjust seat belts correctly for all occupants before starting the engine
- Set all internal and external mirrors accurately to maximise rearward and lateral vision while minimising blind spots
Highway Code: Vehicle security and safety
Ensure all doors are closed securely before moving off. Modern locks and central locking systems should be checked before travel.
Highway Code: Seat belts and head restraints
You must wear a seat belt in cars, vans, and other goods vehicles if one is fitted. Head restraints must be adjusted properly to reduce neck injury during rear impacts.
Highway Code: Mirrors and observation
All mirrors should be clean and adjusted to give you a clear view to the rear and sides before you drive off.
- Assessed at the start of the practical driving test under 'Control — precautions before starting the engine'
- Links to the DVSA 'Tell Me' safety questions asked by the examiner before driving
- The examiner expects smooth, independent cockpit adjustments without prompting before moving off
Skills and practical routine
Follow the five DSSSM steps in sequence every time you enter the vehicle:
Ensure all passenger doors and boot are closed securely. Check the dashboard warning light is off before driving.
The Dutch Reach: opening and closing the door
Use the Dutch Reach every time you open or close the driver's door. Reach across with your far hand (your left hand for the driver's door) to open or close it, instead of using the hand nearest the door.
Reaching across turns your shoulders and head towards the rear of the car. That makes you look over your shoulder, straight into your blind spot, so you check for cyclists or traffic overtaking you before the door opens. It also gives you a last look as you close the door.
It's called the Dutch Reach because of the Netherlands, where there are huge numbers of cyclists. Drivers there learn the habit early, so they never open a door into a cyclist's path.
Slide the base forward until your left foot can press the clutch fully to the floor with a slight knee bend. Set the backrest upright so your wrists rest on top of the steering wheel. Position head restraint level with your eyes.
Confirm your arms have a comfortable bend holding the wheel at ten-to-two or quarter-to-three. Ensure the top rim does not obscure the speedometer or warning lights.
Pull the diagonal belt across your chest with no twists. Click the buckle firmly into the holder and pull gently to confirm it locks properly.
Adjust the interior mirror using the plastic frame (avoid touching the glass) so the entire back window is framed. Adjust both door mirrors so you see a sliver of your car body and the horizon across the middle.
Mirror sightlines & horizon framing
How your interior rearview and wing mirrors should look when seated in the correct driving posture.
Illustrated interior and door mirror sightlines showing correct driver alignment with horizon centered and minimal flank visibility.
4-Minute Practice Routine
Step into any parked car, shut the door, close your eyes for five seconds, and perform the DSSSM sequence out loud until every adjustment feels automatic.
Practice Steps
Core Essentials & Examiner Criteria
What you must get right every time, paired with what the driving examiner marks on your practical test.
What You Must Get Right
Always check your seat position before adjusting any mirrors — moving the seat shifts your eye line completely
Ensure your left foot can depress the clutch fully to the floor while retaining a gentle bend at the knee
Rest your wrists across the top rim of the steering wheel with your shoulder blades remaining against the backrest
Fasten the seat belt flat across your pelvis and chest with no twists before starting the engine
Hold mirror edges by the plastic housing rather than touching the glass surface to avoid smears and glare
Confirm the rigid center of the head restraint sits level with your eye line and top of ears to prevent whiplash
What the Examiner Looks For
Independent and systematic setup of the driving position without verbal prompts or guidance
Verification that all doors are fully closed and any dashboard door-open warning indicators are extinguished
Confident, physical adjustment of all three mirrors while seated in your genuine, natural driving posture
Correct seat belt fastening and release check prior to turning the ignition or initiating moving off routines
Common Mistakes, Test Failures & Safety Tips
Understand how small slips become driving test faults, and how to keep every manoeuvre safe.
Common Learner Mistakes
Adjusting mirrors before your seat
Moving your seat afterwards immediately changes your eye angle, rendering your mirror adjustments inaccurate.
Touching the mirror glass with fingers
Leaving fingerprints smears the glass and causes glare under headlights and bright sunlight. Always hold the plastic rim.
Twisted seat belts
A twisted strap concentrates impact forces rather than spreading them safely across your torso in a collision.
Sitting too far from the pedals
If your leg stretches straight to push the clutch down, you cannot control the bite point accurately.
Essential Safety Tips
The 20-metre eyesight check
Always ensure you can read a standard UK vehicle number plate from 20 metres away with your glasses or lenses on.
Head restraint alignment
The rigid center of the head restraint must sit level with your eye line or top of your ears to prevent whiplash.
Look around, not just mirrors
Mirrors have blind spots over your shoulders. Always perform physical over-the-shoulder checks before moving off.
Lock doors in urban driving
Many modern vehicles auto-lock on moving off; manually verify door security before starting your trip.
Common Causes of Test Failure
How driving examiners categorise errors under the DVSA marking system:
Minor (Driving Faults)
Not potentially dangerous, but marked if repeated.
Starting the engine with a door not fully latched
Failing to observe an illuminated door-open warning light on the instrument cluster prior to starting the engine.
Delayed or awkward mirror readjustment while on the move
Having to adjust the interior or door mirror after moving off because the initial cockpit drill was rushed.
Serious Faults
Potentially dangerous; results in a test failure.
Driving with an unfastened or improperly buckled seat belt
Moving off onto a public highway without securing your seat belt or allowing a passenger to travel unbelted.
Completely misaligned door or rearview mirrors causing blind spots
Entering flowing traffic with mirrors angled down at the road surface or so far outwards that rear visibility is compromised.
Dangerous Faults
Actual danger to you, examiner, or other road users.
Moving off with an open door into the path of approaching road users
Beginning to move off while an unlatched door swings outward into passing cyclists, pedestrians, or motor traffic.
Question 1: Why must you adjust your seat before adjusting your mirrors?
Question 2: How should your interior rearview mirror be framed?
Question 3: How should your left leg sit when pressing the clutch fully down?
Question 4: Where should the rigid centre of your head restraint be positioned?
Question 5: How should you adjust your exterior door mirrors for optimal road coverage?
Theory Test Topics for This Lesson
Reinforce what you have learned by practising official DVSA theory test revision questions.
Revise mandatory sign shapes and regulatory dashboard warning symbols that alert you to unsecured doors or safety system faults.
Practice on GOV.UKUnderstand how proper mirror alignment and physical blind-spot shoulder checks are crucial before joining or emerging at junctions.
Practice on GOV.UKPractise DVSA theory questions covering legal seat belt requirements, driver eyesight rules, and vehicle safety adjustments.
Practice on GOV.UK