To cross a busy road in Engpsh, you can say:

"I need to cross the road."
"I'm going to cross the street."
"I need to get to the other side of the road."
"I'm crossing the road."

It is important to be careful when crossing a busy road, and to look both ways for oncoming traffic before crossing. You may also want to consider using a crosswalk or a pedestrian bridge to help ensure your safety.