X-Intersection
Use this function to design X-Intersection including deflection islands and left or right turn lanes.
The angle of intersection can be any angle.
The function can handle any type of intersection.
The resulting X-Intersection will be 2D drawings.
Run the function from the following locations:
MOUS_ICO Toolbar: Intersection Design: X-Intersection
MOUS_ICO Menu: Road > Intersection Design > X-Intersection
The dialog has a graphic area, which displays the different road arms.
The preview is shown with the default lane setup (right lane driving for Novapoint's international installation).
The intersection is classified as four different road arms A, B, C, and D.
For each road arm, median/deflection island and left/right turn lane can be designed.
All parameters for elements such as median widths, extra lane widths, curve radius, curb, etc., can be defined and edited.
Notes:
Depending on the lane setup (left/right lane driving) selected, the function designs the intersection.
The explanation below is in accordance with right lane driving.
Dimensional parameters
Use this button to define the design vehicle and design speed for the intersection.
Select the design vehicle for the pull-down menu at the field Design vehicle.
Enter the design speed in km/h.
Construction parameters
Use this button to define the parameters related to the road width.
The unit of linear measurement is meters and angular measurement is decimal degrees.
The explanation text below is in accordance with the right lane driving setup.
Lane A and C
Lane width outer (O) - Defines the outer lane width.
Increased widening outer (o) - The parameter refers to the mechanical widening in curves.
The widening can be calculated using the button Calculate. Depending upon the design vehicle, number of lanes and curve radius this function calculates the curve widening.
The same value will be mapped to the field Increased widening outer.
Alternatively, designers can type in a value for widening.
Lane width inner (I) - Defines the inner lane width.
Increased widening inner (i) - Same as Increased widening outer.
Lane B and D
Lane width - Right (Br,Dr) - Defines the lane width.
Lane width - Left (Bl,Dl) - Defines the lane width.
Lane width - Deflection Island right side (Brd, Drd) - Defines the lane width.
Lane width - Deflection Island left side (Bld, Dld) - Defines the lane width.
Radius minor road - Deflection Island right side (Brr, Drr) - Defines the radius.
Radius minor road - Deflection Island left side (Brl, Drl) - Defines the radius.
Standard values
Press this button to reset all parameters to the default values.
Figure 1: Example of lane parameters
Edge lines
Shoulder/pedestrian path width and offset of curb from road edge can be defined for all intersection lanes.
The unit of linear measurement is meters and angular measurement is decimal degrees.
The interface is in accordance with the default driving lane setup (right lane driving for international installation of Novapoint). The explanation text below is in accordance with the right lane driving setup.
Edge lines A and B
Inner shoulder (is) - Defines the inner shoulder.
Outer shoulder major road (os) - Defines the width of the outer shoulder.
Edge lines C and D
Inner shoulder (is) - Defines the inner shoulder.
Outer shoulder major road (os) - Defines the width of the outer shoulder.
Standard Values
Press this button to reset all parameters to default values.
Figure 2: Example of edge line parameters
Smooth corners
Use this button to define the edge line radius of the road lines at the intersection.
Defines the type of curves for edge lines from major to minor roads and the radius.
The unit of linear measurement is meters and angular measurement is decimal degrees.
The interface is in accordance with the default driving lane setup (right lane driving for international installation of Novapoint).
Smooth corners A and B/smooth corners C and D
Defines separate settings for the vehicles diverging from major to minor road and the vehicles diverging from minor to major road.
The program handles three different types of curves as an edge line.
Mark the desired type of curve and define the radius.
Simple curve (R) - Curve with one arc element. Define the radius.
Double curve (R1-R2) - Curve with two arc elements. Define the radius for both arcs.
Compound Curve (2R-R-3R) - Curve with three arc elements. Define the radius for the central arc element. Radius for the other arc elements are default defined as two times and three times that of the central arc element. The user can type in other parameters.
Figure 3: Example of smooth corners parameters
Sketch
Use Sketch to select the centerlines of the intersection. The parameters can be defined and edited before selecting the road arms or after selecting the road arms.
Command prompts for:
Select secondary road centerline, Deflection Island's location (bottom point:
Select the minor road joining the main centerline.
Pick centerline primary road, left arm of intersection as seen from the deflection island:
Select the major road to the left side of the intersection as seen from the minor road selected previously.
A preview of the intersection will be drawn in CAD with the defined values.
When editing values, click the button 'Sketch' to update the preview.
Select Objects
Choose intersection elements such as Left turn separator, Right turn lane, and Islands by marking checkboxes to activate the object. Click the respective buttons to define the parameters involved.
Road A - Left turn separator and Right turn lane.
Road B - Island and Right turn lane (same as that of road A but designed for road arm B and C).
Road C - Left turn separator (same at that of road A but designed for road arm C and B) and Right turn lane (same as that of road A but designed for road arm C and D).
Road D - Island (same as that of road B but designed for road arm D) and Right turn lane (same as that of road A but designed for road arm D and A).
Left turn separator
The left turn lane is an extra lane designed for the vehicles diverging from one road arm to another with a left turn.
All parameters related to the left turn lane can be defined in this dialog.
A traffic separator can also be designed.
The unit of linear measurement is meters and angular measurement is decimal degrees.
The interface is in accordance with the default driving lane setup (right lane driving for international installation of Novapoint).
Width median (a) - Defines the width of the traffic separator.
Width left turn lane (b) - Defines the width of the extra lane.
Length of widening (Lbu) - Defines the length of approach for the intersection.
Taper length (Lki) - Defines the transition length required for shifting the vehicles to the extra lane.
Breaking distance (Ld) - Defines the stopping distance for the vehicles.
Queue Length (LkØ) - Defines the length of the road required to house the vehicles waiting for a left turn.
Taper radius (Rki) - Defines the radius for the tapered element designed at taper length.
Front radius (r) - Defines the radius of rounded edge of the traffic separator at its front end.
Displacement from centerline (+/- f) - Defines the displacement of the front end of the median from the centerline.
Displacement from intersection (dx) - Defines the displacement of the whole traffic separator away from the intersection in the direction primary road.
Curb
All the parameters related to the curb of the left turn lane are defined in this dialog.
The unit of linear measurement is meters and angular measurement is decimal degrees.
The interface is in accordance with the default driving lane setup (right lane driving for international installation of Novapoint).
Distance road marking curb (kt) - Defines the offset from the road edge and the curb.
Radius front circle (rf) - Defines the radius of the rounded edge provided at its front end.
Radius rare circle (rb) - Defines the radius of the rounded edge provided at is back end. The length of the curb will be adjusted with the length of the left turn lane based on this radius.
Displacement rare circle (fb) - Defines the displacement of the back edge of the curb from the centerline.
Taper length (Li) - Defines the length of the taper portion of the curb.
Radius taper (ri) - Defines the radius for taper.
Radius taper transition (ro) - Defines the radius of transition from taper to straight.
Standard values
Press this button to reset all parameter values.
Figure 4: Example of left turn separator
Right turn lane
Right turn lane is an extra lane designed for the vehicles diverging from one road arm to other with a right turn.
All the parameters related to the right turn lane can be defined in this dialog.
The unit of linear measurement is meters and angular measurement is decimal degrees.
The interface is in accordance with the default driving lane setup (right lane driving for international installation of Novapoint).
Right turning lane and/or weaving lane
The right turning lane is the extra lane provided for vehicles diverging from one road arm to the other with a right turn. The right turn lane can be designed in three different types.
Right turn lane only - This type will have extra lane, only for current road arm.
Right turn lane and weaving lane - This type will have an extra lane from both road arms.
Weaving lane only - This type will have extra lane, only for the road arm the right turn leads to.
Depending on the type selected some of the parameters will be disabled. For the type Right turn lane and Weaving lane all the parameters will be available. The following text explains the option Right turn lane and Weaving lane.
Distance approach island (a) - Defines the distance from the rear end of the traffic separator of the current road arm to the start of the right turn lane on the current road arm.
Maximum widening (lane width) (i) - Defines the width of the extra lane.
Taper length out (direction of travel (Lu) - Defines the transition length required for shifting the vehicles to the extra lane.
Length with constant width (Lk) - Defines the length of an extra lane with constant width.
Taper length in (direction of travel (Li) - Defines the transition length required for shifting the vehicles to the extra lane.
Three Corner Island
In addition to the extra lane, a three-corner road island can also be designed.
Distance road marking curb (kt) - Defines the distance of the three-corner road island edge from the road edge.
Radius towards the junction (rf) - Defines the radius for the rounded edge provided to the road island at its front portion.
Corner radius (rb) - Defines the radius for the rounded edge provided to the road island at its rear ends.
Standard values
Press this button to reset all parameters to default values.
Figure 5: Example of right turn lane parameters
Island
Road Island is a deflection island on road arm B and D.
All the parameters related to the deflection island can be defined in this dialog.
The unit of linear measurement is meters and angular measurement is decimal degrees.
The interface is in accordance with default driving lanesetup (right lane driving for international installation of Novapoint).
Deflection Island
Width Deflection Island (hb) - Defines the width of the deflection island.
Length Deflection Island (hl) - Defines the length of the deflection island.
Curvature Deflection Island (Rs) - Defines the radius for deflection island.
Increased distance from major road (+/- a) - Defines the set back of the deflection island from the road edge of major road.
Curb
All parameters related to the curb of the deflection island can be defined in this dialog.
The unit of linear measurement is meters and angular measurement is decimal degrees.
The interface is in accordance with the default driving lane setup (right lane driving for international installation of Novapoint).
Distance road marking curb (kt) - Defines the offset of the road edge from the curb.
Radius rear circle (rb) - Defines the radius of the rounded edge provided to the deflection island at its rear end.
Displacement rear circle (fb) - Defines the displacement of the rear end of the deflection island away from the centerline.
Radius taper (ri) - Defines the radius of taper. The parameter reflects if the angle of intersection is other than 90°.
Standard values
Press this button to reset all parameters to default values.
Figure 6: Example of island parameters
Intersection name
Define a name for the intersection. The name is inserted along the intersection and can be used to identify the junction.
Draw Options
Use this button to configure the drawing setup of different lines of intersection.
OK - Draw
Click OK - Draw to output the intersection to the current CAD drawing.
Next topic: Median