The chief constable of North Wales Police has admitted an "obsession" with tackling speeding motorists.
Mr Brunstrom gave evidence to the Welsh affairs select committee
But Richard Brunstrom denied his obsession came at the expense of more serious crimes.
He was giving evidence to MPs on the Welsh affairs select committee at Westminster on Wednesday.
Conservative MP Nigel Evans told Mr Brunstrom his obsession led to a perception his force was not taking organised crime seriously enough.
Replying to Tory party vice-chairman and former shadow Welsh secretary Mr Evans, Mr Brunstrom said: "I think you are right to say I have, in your terms, an obsession with speeding - I am proud of it."
"Three thousand, five hundred people die on our roads each year and something ought to be done about it."
Mr Brunstrom said his force's record on tackling serious crime stood comparison with any.
He also defended his call to legalise drugs and said it was important that a debate was held on the issue.
Mr Brunstrom, who took on the top job at North Wales Police in January 2001, has become a controversial figure for his strong policy on speeding.
He is also head of road policing for the Association of Chief Police Officers (ACPO).
Earlier this year, Mr Brunstrom's policy on drugs attracted attention when he said he was prepared to see drugs such as heroin openly on sale because drug laws were doing "more harm than good".