Interchanges

Cars already in the roundabout have the right of way. If another motorist refuses to yield, make another trip around the circle until you can safely make your turn. If there are two lanes stay in the left most lane. Follow the left lane of the roundabout around until it comes out to the left intersection.

Describe how to complete a left turn in a roundabout

Cars already in the roundabout have the right of way. If another motorist refuses to yield, make another trip around the circle until you can safely make your turn. Stay in the right most lane and follow the curve out to the intersection

Describe how to complete a right turn in a roundabout

Cars already in the roundabout have the right of way. To make a U-turn or take what would be a left-hand turn at a traditional intersection, enter the roundabout and then merge into the left lane. First looking left and yielding to traffic in the circle. Once in, stay in the leftmost lane - if it is a two lane roundabout, following the lane around until you reach your exit. Then, while using your turn signal, follow the curved line out of the roundabout. There should be no reason to stop, but be prepared to stop for bicyclists, pedestrians, and unyielding cars.

Describe how to complete a u-turn in a roundabout

Cars already in the roundabout have the right of way. If another motorist refuses to yield, make another trip around the circle until you can safely make your turn.To go straight, enter the roundabout and then either stay in the right lane or merge into the left lane -if it is a two lane roundabout.Once in, stay in that lane until you reach your exit.

Describe how to proceed to the other side of the intersection through a roundabout

The interchange includes crosswalks, bicycle paths and pedestrian signals. Bicyclists and pedestrians use the signalized pedestrian crossing and then are directed to the center pedestrian island in the middle of the interchange. Rectangular Rapid Flashing Beacons - two rapidly and alternately flashed rectangular yellow lights - will be activated at the free-running right turn with a pedestrian push button. Pedestrians will cross at the Rectangular Rapid Flashing Beacons when the pedestrian indication is activated.

How do pedestrians or bicyclists cross a DDI?

Drivers will notice that opposing traffic crosses each other at the signals on each side of the bridge/overpass. Drivers will need to follow the road signs, signals, raised islands, and pavement markings. When driving on a traditional overpass, drivers stay on the right side of the overpass. A DDI involves driving on the left side of the overpass. Vehicles are essentially using the opposite side of the overpass to cross over Interstate 86. Motorists will need to stop at the stop lines to ensure they are not too far out in the intersection where they could impede cross traffic, pedestrians or bicyclists.

How should you drive a DDI?

You will notice more open space in the interchange, and a set of traffic lights in the center.Make sure to stop at the stop lines so you won't be too far out in the intersection where you might impede cross traffic.

How should you drive a SPUI?

The first one in Idaho is located at the interchange of I-86 and Yellowstone Avenue (U.S. 91) in Chubbuck.

In Idaho, where is the DDI located?

Observe the traffic flow in the video

Watch this video that demonstrates how to drive the Idaho DDI http://itd.idaho.gov/projects/d5/ChubbuckInterchange/ddInterchangeVideo.html

In a roundabout, traffic is forced to slow down to navigate the intersection.There are no traffic signals in a roundabout. Depending on the situation, traffic may not have to stop, which can be a more efficient way to move traffic than a signal. Entering traffic yields to circulating traffic, which always keeps moving. A study by the Institute for Highway Safety indicates roundabouts reduce crashes by 75 percent at intersections where stops signs and signals were previously used.

What are the benefits of a roundabout?

Diverging Diamond Interchange, or DDI, temporarily channels traffic lanes to the left side of the roadway in order to create direct access with the interstate. The diverging diamond interchange is a significant improvement in safety, since no left turns must clear opposing traffic and all movements are discrete, with most controlled by traffic signals.

What is a DDI?

Single Point Urban Interchange A SPUI, or single point urban interchange, gets its name from the traffic signals that control turns from a "single point" at the center of the interchange. This design is well suited for intersections that need to move high volumes of traffic in a smaller space. We most often see these over Freeways.

What is a SPUI?

In most cases there will be another exit further down the road that you can take, from which you can then turn back to the other side of the freeway and get back to where you needed to be.

What should you do if you exit to the freeway by mistake?

If you exit the freeway by mistake, you cannot travel straight across the road and get on at the other side. Turn left or right onto the intersecting road and find a safe place to turn around to return to the correct entrance to the freeway.

What should you do if you get off the freeway at the wrong exit?

Going Straight -Stay in one of the two right lanes. See the Orange Arrows in the picture

Which lane should you drive on a SPUI if you wish to go straight?

Stay in one of the two left-turn lanes. See the green left arrows in the picture.

Which lane should you drive on a SPUI if you wish to make a left turn onto the I-84 Freeway?

The exit ramps divide traffic into two lanes: one for turning left to go through the intersection and one for turning right to connect to the road going away from the intersection. See the blue arrows in the picture.

Which lane should you drive on a SPUI if you wish to make a right turn onto the I-84 Freeway?

As drivers approach the intersection, they will proceed through the traffic signal at the entrance to the interchange and follow their lane to the opposite side of the overpass. They then proceed through the second traffic signal and follow their lane back to the right side of the road. Road signs, signals and pavement marking will help guide drivers to where they need to go.

You are driving down the DDI on Yellowstone avenue and wish to go straight. Describe how would you proceed forward. Hint: see the green arrows.

As drivers approach the interchange in the left lane, they will proceed through the traffic signal at the entrance to the interchange and follow their lane to the opposite side of the road. Once they cross the bridge, they will make a left-hand turn onto I-86.

You are driving on the DDI and wish to turn onto I-86. Describe how you would proceed. Hint: see the orange and pink arrows.

Turning right - Drivers will stay in the right lane when exiting the interstate. They turn right and merge onto the roadway as they would with any yield sign. They're advised to watch for pedestrians. Turning left - Drivers exit the interstate in the left lane and merge into traffic onto the roadway. They're advised to watch for pedestrians. If drivers exit the freeway by mistake, they cannot travel straight across the road and get on at the other side. They will need to turn left or right onto the intersecting road and find a safe place to turn around to return to the correct entrance to the freeway.

You are exiting the I-86 freeway. Describe what to do to travel East or West onto Yellowstone Avenue. Hint: see Yellow and Blue arrows.

You are approaching a roundabout intersection.

what does this sign indicate?

The roundabout is a one-way circular intersection where you must always turn right to enter and exit. The most common sign seen when approaching a roundabout is a warning sign with an arrow in a circle pattern. In a roundabout intersection, all drivers must yield the right of way to vehicles that are already in the circle. Drivers must turn right and merge into the circle whether they need to make a right turn, a left turn, a U-turn or continue forward at that intersection.

what type of intersection is this?