(August 9, 2018) Next week, the intersection of Legacy Drive and Main Street will reopen in a new configuration. This innovative type of intersection, called a “Single Point Urban Interchange” (SPUI), takes a widely divided intersection operating with two traffic signals and compresses it into one large intersection where all movements are controlled by one traffic signal.
Other SPUI intersections in North Texas can be found at Eldorado Parkway and US 75 in McKinney and at Parker Road and US 75 in Plano. SPUI intersections increase efficiency and safety because motorists no longer have to stop at a second red light before completing their movement through the intersection.
Never Stop in the Middle of the Intersection
When Legacy & Main reopens next week, the most important thing to know is that you will never stop in the middle of the intersection. Once you receive a green light, you will proceed all the way through the intersection. As shown in the image attached, the new intersection will not have any stop bars painted in the middle of the intersection. If your light turns red before you enter the intersection, you will stop at the stop bar painted in front of you. If you are already past the stop bar when the light turns yellow and red, you will continue all the way through the intersection in the same way you do at a standard traffic signal. It may seem like a long way, especially on Legacy Drive, but keep going and clear the intersection.
Red Light, Green Light
The unique shape of a Single Point Urban Interchange means that it has several traffic signal poles in various places. This may seem confusing at first, but you only need to pay attention to the signal indications that are pointing at you when you enter the intersection. If you are traveling on Main Street, the through lanes and left-turn lanes will be separated and have their own set of signal indications. If you are traveling on Legacy Drive, the through and left-turn lanes will be next to each other and you will see both the left-turn and through signal indications side by side (like a standard intersection). If you are in a left-turn lane, your signal indication will look like a green, yellow, or red arrow. If you are in a through lane, your signal indication will look like a green, yellow, or red circle.
The old intersection had a second set of traffic signals that you had to watch for after entering the intersection, but the new configuration does not have this. Once you receive your green indication, you will enter the intersection and proceed all the way through the intersection without seeing another signal indication pointing at you. Again, it may seem like a long way, but keep going and clear the intersection. The signal is timed to give you enough time to get across the entire intersection.
Connect the Dots
The Single Point Urban Interchange is a large intersection and so dotted lines are painted on the pavement to guide the left-turn movements through the intersection. Once you start making your left turn, focus on the dotted line and follow it all the way through - keep going without stopping. Through traffic on Main Street and on Legacy Drive will simply proceed straight across the intersection.