A driver who pointed a sawn-off shotgun at the face of a woman in another car after she gave him the finger has been jailed for what a judge labelled "total madness".

Paul Wardle, 39, was driving on the Point Nepean Road in Rye in February, 2014, when he exchanged words with another car's female passenger, Sarah Tonks, after the cars had each been trying to get ahead.

She gave him the finger and he pulled out the gun.

"In short, it was nothing to get too excited about, nothing to give rise to road rage, including what transpired. Total madness," County Court Judge Michael Tinney told Wardle on Wednesday.

Wardle has jailed for two years, with a minimum of 14 months, for five firearm offences. It takes into account more than nine months already served in custody.

AAP CM/MI/ET