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TEA
Functions
Office of the Special Assistant for Transportation Engineering
Traffic Engineering Branch
Better Military Traffic Engineering
Intersections Calculators
Intersection Sight Distance Calculator
Intersection Sight Distance Calculator
Tutorials
Calculators
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Intersection Sight Distance Calculator
Case
No Control
Stop Control - Left turn from the minor road
Stop Control - Right turn from the minor road
Stop Control - Crossing maneuver from the minor road
Yield Control - Left or right turn from the minor road
Yield Control - Crossing maneuver from the minor road
Traffic Signal Control
All-way Stop Control
Left Turns from the Major Road
Will signal operate on flashing during off-peak hours?
Yes
No
Are right turns permitted on red?
Yes
No
Vehicle Type
Passenger Car
Single-unit Truck
Combination Truck
Design Speed (Major Road)
15
20
25
30
35
40
45
50
55
60
65
mph
Design Speed (Major Road)
15
20
25
30
35
40
45
50
55
60
65
mph
Design Speed (Minor Road)
15
20
25
30
35
40
45
50
55
60
65
mph
Skew angle
°
Grade
-6% (down grade)
-5% (down grade)
-4% (down grade)
-3% to +3%
+4% (up grade)
+5% (up grade)
+6% (up grade)
Number of Lanes to be crossed
1
2
3
4
lanes
Median Width
ft
Width of intersection to cross
ft
Intersection Sight Distance: Approach 1
ft
Right Turn Intersection Sight Distance
ft
Design Speed (Major Road)
15
20
25
30
35
40
45
50
55
60
65
mph
Grade
-6% (down grade)
-5% (down grade)
-4% (down grade)
-3% to +3%
+4% (up grade)
+5% (up grade)
+6% (up grade)
Intersection Sight Distance: Approach 2 And 3
ft
Source:
American Association of State Highway and Transportation Officials.
A Policy on Geometric Design of Highways and Streets, 6th Edition.
2011. Chapter 9.
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Instructions and Definitions
Instructions Text
Instructions
: All-Way Stop Control
(1)
Instructions
: General Instructions
(1)
Instructions
: Left-Turns from Major Road
(1)
Instructions
: No Control
(1)
Instructions
: Stop Control: Crossing Maneuver from the Minor Road
(1)
Instructions
: Stop Control: Left-Turn from the Minor Road
(1)
Instructions
: Stop Control: Right-Turn from the Minor Road
(1)
Instructions
: Traffic Signal Control
(1)
Instructions
: Yield Control: Crossing Maneuver from the Minor Road
(1)
Instructions
: Yield Control: Left- or Right-Turn from the Minor Road
(1)
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Table of Contents
Signs and Markings
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Passing Sight Dist.
Traffic Signals
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Layout Dimensions
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