John McGoldrick, Mersey Tunnels Users Association representative, said: "Obviously if drivers are committing offences which could cause risk to other drivers then they should be dealt with.
"But I hope they are not intending to blitz drivers for trivial offences."
Fixed penalties dropped from 341 in the first seven months of last year to 169 during the same period this year. Arrest reports were also down by 41%.
In the email, seen by the Daily Post, Mr Tierney states: "Please highlight the facts and figures to your respective blocks as a priority and I sincerely expect that the considerable downward trend will be reversed when the next set of statistics are produced."
Tunnels officers can issue £60 fixed penalty notices to drivers for speeding and crossing lanes or £40 fines for more minor offences such as using mobile phones or not wearing seatbelts.
Merseytravel, who operate the tunnels police, last night said all the money raised from fines went to the Crown Prosecution Service and insisted there were no plans to try to divert the money into tunnels coffers.
A spokesman said: "The intention of the email was to remind all tunnels police officers to follow the correct procedures and processes if an offence is committed.
"Fixed penalty notices are issued for speeding offences or crossing lanes dangerously. Any fines go directly to the Crown Prosecution Service, not to Mersey Tunnels. We receive no benefit whatsoever.
"The 50% drop in notices issued could be a combination of a number of factors, including more regular police patrols."
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