A HGV was seen swerving between lanes on the eastbound carriageway of the A55 by Penmaenmawr.
The driver was later arrested on suspicion of drug driving after testing positive for cocaine.
NWP Roads Policing Unit took to social media on Wednesday, October 25 to say: "Thank you to those who called us yesterday reporting a HGV swerving between lanes on the eastbound carriageway of the A55 by Penmaenmawr
"We located the vehicle a short while later and stopped it - the driver was arrested on suspicion of drug driving after testing positive for cocaine.
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"He has since been released pending further investigation as we await the return of the forensic results.
"Keep reporting these types of incidents to us - it really does make a difference."
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