Always use all of a merge lane to merge – this gives you time to get up to speed and find a safe gap to merge like a zip. In this example, the person merges too early and cuts in front of a person on the main road. The person on the main road now suddenly finds themselves tailgating the person who merged. This isn't a safe merge. The person merging could've used the rest of the merge lane to get up to speed and leave a safe gap to the person on the main road. Merge lanes taper to naturally guide