The city-wide implementation of 20 mph zones in Portsmouth had little effect on the speed and no effect on the numbers killed or seriously injured on its streets, it created.
But the system has contributed to a reduction in accidents leading to minor injuries, an analysis of the scheme of the first year has found.
The survey carried out by consultants of Atkins for the Department of transport, reveals that the average traffic speed across fell through the city by a "not statistically significant" 0.9 miles per hour, compared to the previous three-year average.
In certain areas where she had been average speeds over 24 mph, the average of seven miles per hour fell.
While the number of people killed or seriously injured 19 - average recorded in the three years preceding the 20 mph rules remained - the number, which easily hurt significantly, to 138 dropped by a three year average of 166.
Although the report concludes that improvements compared to national trends are insignificant, you will add more data will provide more robust results.
"This interim report is limited, what can say about the regulation of 20 mph," said Portsmouth City Council's Chief Transport and road management, Simon moon.
"We have to wait until it has been running for three years before we to get the full picture."
"But there are some encouraging signs in it above all the result on the streets where speeds were significantly higher than 20 mph if we impose the new speed limit."
"We wanted our roads more usable for people to live on you, as pedestrians and cyclists."
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