After overtaking another motor vehicle on a two-lane road, you can best judge when it is safe to drive back into the right-hand lane by

first, the romans stayed isolated because they had to defend their own territories from neighboring cities that were harassing them, like the etruscans. second, once the romans managed to defeat their neighbors, and started to expand their territory, they started to build roads and bridges. finally, now that the romans have covered their territory with roads functioning as highways, they could mobilize their legions faster to assemble larger military units in a specific place.

you should try adrenaline. it kicks in in situations like this.