The number of road traffic offences committed on Bute rose sharply in the peak summer months of July and August, compared to the same period last year.
But the instances of assault, anti-social behaviour and theft all dropped during the same two-month spell.
Local Police Scotland sergeant David Watt gave the latest policing figures for the island to members of Bute Community Council this week.
There were 11 road traffic offences during July and August this year, compared to only three in the same period during 2014.
But the number of assaults fell from five to four, while anti-social behaviour dropped from ten incidents to six and thefts from five last summer to two this year.
The number of offences under the Misuse of Drugs Act during the two months remained constant, with five incidents both last year and this year.
Police on Bute dealt with the same number of incidents - 171 - in both July and August of this year. July saw 54 crimes or offences, 41 of which were detected - a detection rate of 76 per cent - while in August, 51 out of 64 crimes or offences were detected, a rate of 79.7 per cent.