When two lanes merge, there is often a yield line to separate the intersection. . Any vehicles crossing the line must give way first. . However, , sometimes two lanes join without a yield line. . Here , Who's Coming? First served first . The car in front of you has the right of way . This does not give anyone permission to accelerate to enter first , because this is both dangerous and rude . When two cars are neck and neck , you must For one to slow down to let the other in . This is a small act of courtesy that will go a long way towards improving road safety and reducing road rage . If there are many cars merging into an area like this , each lane should alternate . [ Form One Lane , Traffic Controls , Part C - Knowing the Rules of the Road , ACT Road Rules Guide ]