Perhaps it was some of the back-to-school and back-to-work traffic so common at summer's end. Or maybe it was just a day of bunched-up accidents.

But Long Island's major roads Wednesday morning seemed much more congested than usual.

The most dramatic of the crashes was perhaps an overturned milk truck at 6 a.m. on the Long Island Expressway's eastbound exit ramp to northbound Route 135, the Seaford-Oyster Bay Expressway.

The toppled truck sent cartons of milk and dairy products onto the ramp at Exit 44, according to informny.com, the state Department of Transportation website.

Crews managed to clear the ramp for traffic at about 9:20 a.m., the site said.

A Nassau County police spokesman, who said there were no injuries in the milk-truck spill, also noted that the LIE seemed "extra busy" Wednesday morning.

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Five other crashes on major roadways happened between 6 and about 10:30 a.m., including two at Exit 40 on the LIE, according to informny.com:

** At 10:30 a.m., a luxury coach bus and a tractor-trailer crashed on the westbound LIE in Nassau, near Exit 40, blocking the HOV lane for about an hour.

** At 8:43 a.m. on the westbound Southern State Parkway at Exit 36 in Suffolk, a two-vehicle accident closed the left lane for about 15 minutes.

** At 8:38 a.m., a three-vehicle crash on the northbound Meadowbrook State Parkway at Exit M6 in Nassau blocked the left lane, also for about 15 minutes.

** At 8:20 a.m., a multiple-vehicle crash closed the left and center lanes of the eastbound LIE at Exit 40E in Nassau for more than 40 minutes.

** At 7:32 a.m., also on the LIE, another multiple-vehicle bang-up closed the left lane of westbound traffic near Exit 51 in Suffolk for a little more than an hour.

Suffolk County police said another accident at 7 a.m. on southbound Patchogue-Yaphank Road at 7:02 a.m. caused traffic delays under the LIE overpass.

A sport utility vehicle overturned, but a polices spokeswoman said it appeared there were no serious injuries. Traffic was restored in about 45 minutes.