A man who crashed his car into a lamppost was driving drunk due to "angst".

Peter Alfred Reid, 63, had visited a brewery on November 29, the Whanganui District Court heard on Tuesday.

He had gone to the brewery on a bus with his partner, but was driving his car later that day when he went off the left side of the road, over the kerb, and into a lamppost, police prosecutor Sergeant Stephen Butler said.

A breath test showed him to have 728mcg of alcohol in his system. The legal limit is 250mcg.

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Judge David Cameron noted Reid had gone on the bus but then made the decision to drive.

"There was a degree of angst, your honour," Reid told him.

Defence lawyer Harete Hipango said it was a "rough trip on the bus".

Ms Hipango said Reid, a former orchard manager, lost his job as a result of his offending.

He pleaded guilty to driving with excess breath alcohol third or subsequent.

Judge Cameron remanded him to March 10 for sentencing.