VicRoads acting director of road safety Antonietta Cavallo said the fines had been increased to better reflect the seriousness of high level speeding and drink-driving offences.

"Drivers caught speeding at 30-35kmh over the speed limit will face fines of $380 and eight demerit points," she said.

"If a driver is speeding 45kmh or more over the speed limit, the courts will have the power to impose fines of up to $2336 or up to $3504 for heavy-vehicle drivers.

"Those caught with a blood alcohol content of .10 will face immediate licence suspension in addition to a fine of more than $526, with the potential for courts to impose a penalty of up to $2,336 - about double the previous maximum court penalty."

Ms Cavallo said too many motorists still thought they could have a mobile phone in their hand and be texting or emailing while trying to drive in traffic.

"They already risk an on-the-spot fine of more than $230 and the same penalty applies for all drivers and passengers over 16 years who are in a moving vehicle and not wearing a seatbelt," she said.

From November, drivers can also be fined $234 if they have passengers aged over 16 who are not wearing seat belts.

Penalties are also being increased for failing to wearing a helmet while riding a motorbike or bicycle, failing to obey traffic lights and passing stationary trams.