Not to pile on you, but I should probably show you this:
turn onto something:
1. Lit. to walk or steer one's vehicle onto a road, highway, or path. Turn onto the main road and go west about a mile. As she turned onto the familiar highway, she realized that she had left her purse in the store
2. turn onto someone or something; to become interested in someone or something. Jeff turned onto electronics at the age of fourteen. I tried to get her to turn onto me, but she could only think of John
1. To direct one's way or course into something: The truck turned into the gas station
2. To cause someone or something to take on some character, nature, identity, or appearance; change or transform someone or something into someone or something: The designer turned a rundown house into a show place. We turned the spare room into a nursery.
3. To change into something or someone; become transformed into something or someone: The night turned into day. In the story, straw turns into gold
4. To convert something into something: The singers turned their talent into extra money
5. To pour, let fall, or otherwise release something into some receptacle: The chef turned the soup into the dish
That should clear up any misunderstandings about the meanings of into
, especially when it comes to roads.