You may have missed a few of the miscellaneous trophies but if so, go to the relevant trophy on how to achieve them. On completion of this step, you will have earned the following trophies: Refer to 0% Non-Delivery for delivering all convoys in every level. Extra vehicles range from 3-16 depending on the level. Once you have completed a level for the first time, you have the option to replay the level and deliver convoys, which are essentially extra vehicles at the same time. The purpose of this step is to complete every level in the game whilst delivering all the convoys in every level too.
Step 1: Complete all levels whilst delivering all convoys Even moving one of the support beam points can make a structure stand firm where as before, it kept falling down. Some little tweaks to structures help a lot. This is just an effect and doesn't affect the outcome of the level in any way. It doesn't matter if the people in the vehicles fall off. Address these first to attempt to correct the structure so it stands. These are the weak points on the structure and which are causing the structure to fall down.
Below are some tips and general advice about Bridge Constructor Portal that will help you in every level: