A father has witnessed the car crash which killed two of his young daughters on Father's Day in his rearview mirror.
Kaele Lynn Polzin, 22, and Sara Summerlyn Polzin, 16, from Michigan, were travelling in a Toyota Prius Sunday afternoon, with a 22-year-old woman behind the wheel.
The three were travelling northbound on the highway, while Kaele and Sara's father was in a vehicle ahead of them, the Port Huron Times Herald reported.
Just after 2.30pm on the Sunday, which happened to be Father's Day in the US, a woman driving south on the highway crashed into the Prius, after she tried to avoid a collision and crossed over the median strip.
Both Kaele and Sara were pronounced dead at the scene, while both drivers were taken to hospital.
"This afternoon while we were driving up north for vacation a car heading south lost control, drove into the median, flipped over, and landed on the car behind us," Lori Polzin, the girls' mother, wrote in a message that was posted to a GoFundMe page.
"The car containing my daughters. Kaele and Sara were killed. Sam has a broken collar bone, a broken finger, and a concussion. I am thanking God we didn't lose her too."
The Port Huron Times Herald reported the father of Kaele and Sara, Mike Polzon, witnessed the crash and told investigators he and his daughters were headed for a family vacation.
A GoFundMe set up for the Polzin family describes the crash as "tragic and unavoidable" and a message from Kaele and Sara's mother said "no one is to blame".
"This was an accident," Lori Polzin said.
"A huge unpreventable tragedy. A split second took away two of my babies. Please don't compound my pain with anger and lies."
The money raised on GoFundMe aims to alleviate the stress for the Polzin family and $46,450 ($A61,503) has been raised already.
According to The Detroit News, the family is asking for donations to causes both Kaele and Sara were passionate about.
The family has chosen the Trevor Project, which focuses on suicide prevention for LGBT youth, as Sara was an advocate for gay rights.
Kaele worked for Easterseals, an organisation which provides disability services.
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