The major Merseyside Police operation saw four people arrested close to the Birkenhead and Liverpool entrances of the Birkenhead tunnel, while officers stopped more than 40 vehicles.
A crossbow with bolts, a baton, crack, cannabis and £4,000 in cash were seized by officers executing drugs warrants.
An 18-year-old man from Birkenhead was arrested on suspicion of supplying Class A and B drugs, malicious communications, stalking and criminal damage.
A 25-year-old man and an 18-year woman were arrested on suspicion of drugs supply, and a 37-year-old woman received a cannabis caution.
During the roadside operations six traffic tickets were issued for driving offences and one vehicle was seized for being driven without insurance.
A number of individuals were also stop searched.
Inspector Chris Lucan-Pratt said: “The aim of this activity is to disrupt those criminals who think they can get away with selling drugs on the streets of Birkenhead and elsewhere, and move their illicit goods around on our roads.
“I know from the messages we receive that the honest, hard-working people of Birkenhead support our action to tackle drug dealing, and share our determination to make the area a safer and better place to live.
“I want criminals to realise that Birkenhead is not a safe place to carry out your illegal activity – we will continue to carry out warrants, roadside checks, stop searches and more and sooner or later, you will face justice for your crimes.
“I hope this activity provides some reassurance to those local residents who suffer at the hands of such criminals, and I would urge anyone who knows about drug dealing in their area to contact us so that we can take action to bring those people to justice.”
Anyone with information on drug dealing in their area should contact Merseyside Police social media desk via Twitter @MerPolCC or Facebook ‘Merseyside Police Contact Centre’.
You can also call 101 or contact the independent charity Crimestoppers anonymously on 0800 555 111, or via their website here: https://crimestoppers-uk.org/give-information/forms/give-information-anonymously