Think about what happened when you used the model intersection. What type of problems do transportation engineers solve and what are some of the things (factors) they work to balance? 1. Click the tool 2. Click the tool and make your final improvements to the class intersection 3. Think about what problems transportation engineers solve when designing an intersection. Click on the and explain what factors engineers need to take into consideration to create a safe and efficient intersection. 4. Click the to add to your journal.