The increased enforcement runs through Tuesday.
State police will be on the lookout for drivers who are impaired, speeding, not wearing seat belts, using cellphones illegally and committing other violations.
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During last year’s Fourth of July weekend, troopers issued more than 1,200 speeding tickets and arrested 39 people for driving under the influence. They also investigated more than 300 accidents. Three people died in accidents.
State police also are reminding people that fireworks are illegal in Connecticut. Only non-explosive and non-aerial sparklers and fountains are legal.