Published: Jan 23, 2013 12:35 PM EST
Updated: Jan 24, 2013 11:56 AM EST

COLLIER COUNTY, Fla.- A Southwest Florida tragedy has many people wanting to help. Cecelia Douglas and her two daughters, age three and four, died after their car swerved off the road on Alligator Alley and ended up in a canal.

Funeral services are scheduled for Saturday at 2:00 p.m. at the First Baptist Church of Mount Dora.

Nathan Douglas, husband and father to the victims, has been a law enforcement officer for the Florida Fish and Wildlife Conservation Commission since 2010.

The Florida Highway Patrol says Douglas hit the back of a box truck before going off the road. The cable barriers along I-75, snapped instead of keeping their car from going into the canal. According to the State Department of Transportation, the cable barriers work 99 percent of the time.  They were installed more than six years ago, after transportation officials saw numerous cars going into canals on the Alley. Some of those canals are up to 30 feet deep.

The barrier system cost $4 million and is designed to signal the Regional Traffic Management Center if a car breaks through. That function did work on Monday, and troopers quickly found the scene.

Now, FDOT officials are investigating how Cecilia Douglas' car broke the barrier, and plunged into that canal. 

Donations can be made at Suntrust Bank to the Douglas Family Memorial Account number - 1000157840900.