What to expect at a roadside check with a modified car
Police have nothing against safe, legal tuning. A modified vehicle isn't checked more often than any other — if the modifications are in order and you have your documents, the check goes just as fast as for a stock car.
What's checked during a routine traffic stop
- driving licence
- vehicle registration certificate
- the vehicle's roadworthiness (working lights, tire tread depth)
- compliance with emissions and noise limits
- fitness to drive
What inspectors focus on with modified vehicles
Offset, sufficient clearance from the wheel arches and body, kit homologation.
Reasonable ground clearance for both lowered and raised suspension, valid kit homologation.
Homologation marks on lights, correct aim after a suspension change.
Secure mounting of spoilers and side skirts, absence of dangerous sharp edges.
Noise within allowed limits, homologation mark on the part.
Whether individual modifications conflict with each other — e.g. suspension + alternative wheels + spacers all at once.
What to carry so the check goes quickly
- Vehicle registration certificate (or the electronic eTechničák equivalent)
- Technical assessments or homologation documents for installed parts
- Proof of a registered modification, if one was required
- Photo documentation of the modifications (optional, but speeds up the check)
Missing documents for completed modifications can slow down a check and in some cases lead to a fine or a notice to fix the issue — even if the modification itself is otherwise fine.
For more on how individual modifications affect each other, and what to watch for when combining several changes at once, see How modifications affect each other.