Police have made 39 arrests in an operation targeting the transport network around Wirral.
Metal detector arches were set up at train stations, drug sniffer dogs were used at ports and checkpoints set up at the traffic tunnels.
About 200 officers from Merseyside Police were involved in the operation on Friday night and Saturday morning.
A total of 39 people were arrested for mainly motoring and public order offences, police said.
Officers seized 57 vehicles and 17 street cautions were given for possession of cannabis.
Ten people were issued with fixed penalty notices and 25 were issued with summons.
Merseyside police said the operation was "successful".
A spokesperson said it aimed to "disrupt criminality, target offenders and send out a strong message that crime and anti-social behaviour will not be tolerated".