The assault happened on May 11 at around 4:45 a.m. in the 5300 block of North I-35. Police say the suspect, who was riding a bicycle, approached the victim's vehicle and then physically and sexually assaulted the victim.
The victim was able to escape from the suspect, get help, and call the police. The suspect fled the scene.
"According to the National Sexual Assault Hotline about 20 percent of sexual assaults are committed by a stranger," said Piper Stege Nelson of "Stop Abuse For Everyone" or SAFE Austin.
Police describe the suspect only as a Hispanic male around 5'9" to 6' tall and last seen wearing shorts and muscle shirt.
The suspect was riding a blue bike with red paint on it.
"One in five women have experienced some form of sexual assault in their lifetime and almost a quarter of men have experienced some sort of unwanted sexual contact in their lifetime," said Laura Palumbo of the National Sexual Violence Resource Center.
On Friday police would not say if the victim was a man or woman, where exactly the assault took place, or what led up to the assault.
"It is essential that survivors of sexual assault know that it is not their fault and that we listen to them and that we start by believing," said Nelson.
Anyone with information regarding this incident is asked to call the APD Sex Crimes Unit at 512-974-5230, Crime Stoppers at 512-472-TIPS, submit a tip on the Crime Stoppers website, or use the Crime Stoppers app. All information is anonymous and may be eligible for a reward of up to $1,000.
You can also submit tips anonymously through APD's mobile app, Austin PD, which can be downloaded free on iPhone and Android.
If you or someone you know has been impacted by sexual violence, you can seek support from APD Victim Services (512-974-5037) or SAFE (512-267-7233). Police advise calling 911 if you at any time feel concerned for your safety.