Officers from the Operational Policing Unit (OPU) stopped a grey BMW X3 near Junction 6 of the M5 at around 2.10am.
Shortly afterwards, a grey BMW M3 was stopped by officers at Junction 5 of the M5.
Officers found cannabis in both vehicles and a large quantity of cash and mobile phones were seized. Eight men were arrested at the scene.
Four men, aged 30, 31, 36 and 39, were arrested on suspicion of being concerned in the supply of a controlled drug and taken to Worcester Police Station where they remain in custody helping police with enquiries.
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Four men, aged 23, 25, 27 and 29, were arrested on suspicion of being concerned in the supply of a controlled drug and taken to Hereford Police Station where they remain in custody helping police with enquiries.
The 25-year-old was further arrested on suspicion of drug and drink driving.
Detective Inspector Dave Knight of South Worcestershire CID said: “This was a great result for OPU to stop these cars and make eight arrests, following good intelligence work by officers.
“The men in custody are suspected of bringing drugs into south Worcestershire to sell on which we know causes harm on the communities we are here to protect and serve.
“We will not tolerate drug dealing in our county and will always act on information given to us to help locate and arrest those suspected of being involved and disrupt their criminal enterprises.”