Wisconsin Administrative Code › Department of Transportation › Chapter Trans 205 - County Trunk Highway Standards › Section Trans 205.03 - County trunk highway standards

Current through June 24, 2024
(1) The design
			 standards for urban county trunk highway improvement projects shall conform
			 with the applicable department of transportation criteria, and, if applicable,
			 with the federal criteria for the class of highway involved. The minimum design
			 standards for rural county trunk highway improvement projects shall be as set
			 forth below for each of the rural county trunk highway functional
			 classifications. The functional classification for a particular rural county
			 trunk highway segment shall be that shown for the segment on the most current
			 department of transportation rural functional system map prepared under ch.
			 Trans 76 for local transportation aids purposes or, if applicable, on the most
			 current federal aid system map.
Note: Chapter Trans 76 was repealed.
(2) The rural county trunk highway minimum
			 design standards for each of the rural county trunk highway functional
			 classifications are as shown in the following tables:
Table (a)- ARTERIALS*
TRAFFIC VOLUME
ROADWAY WIDTH DIMENSIONS IN FEET
BRIDGES***
Design Class
Design ADT
Design Speed MPH
Traveled Way
Shoulder
Roadway
Design Load
Clear Roadway Width in Feet
A1
Under 3500
60**
24
6
36
HS20
36
A2
3500-7000
60
24
10
44
HS20
44
A3
Over 7000
65
24(2)
6 Left/10Right
40(2)
HS20
40
*Minimum design standards for sight distance, horizontal
				alignment and vertical alignment shall conform with applicable department of
				transportation criteria.
**For design class A1 the desirable design speed is 60 mph,
				but a minimum design speed of 55 mph is acceptable.
***The full width of bridge approach roadways shall continue
				across all new bridges, except when a bridge is a major structure on which
				design dimensions are subject to individual economic studies because of high
				unit cost.
TABLE (b)- COLLECTOR*
TRAFFIC VOLUME
ROADWAY WIDTH DIMENSIONS IN FEET**
BRIDGES
Design Class
Current ADT
Design ADT
Design Speed MPH
Traveled Way
Shoulder
Roadway
Design Load
Clear Roadway Width in Feet
C1
0-400
40
22-24
2-4
26-32
HS20
26-30
C2
400-750
Under 1500
50
22-24
6
34-36
HS20
28-30
C3
1500-3500
55
24
6
36
HS20
32-34***
C4
Over 3500
60
24
8
40
HS20
40***
*Minimum design standards for sight distance, horizontal
				alignment, and vertical alignment shall conform to the applicable department of
				transportation criteria.
**Where a range of widths is shown, the smaller number is the
				minimum width and the larger number is the maximum width eligible for federal
				or state project participation.
***Bridges in design classes C3 or C4 having a total length
				over 100 feet may be designed with a clear roadway width of 30 feet.
TABLE (c)- LOCAL*
TRAFFIC VOLUME
ROADWAY WIDTH DIMENSIONS IN FEET**
BRIDGES
Design Class
Current ADT
Design ADT
Design Speed MPH
Traveled Way
Shoulder
Roadway
Design Load
Clear Roadway Width in Feet
L1
0-250
40
20-22
2-4
24-30
HS20
24-28
L2
250-400
40
22
2-4
26-30
HS20
26-30
L3
400-750
Under 1500
50
22-24
6
34-36
HS20
28-30
L4
1500-3500
55
24
6
36
HS20
30-34***
L5
Over 3500
60
24
8
40
HS20
40***
**Minimum design standards for sight distance, horizontal
				alignment and vertical alignment shall conform with applicable department of
				transportation criteria.
**Where a range of widths is shown, the smaller number is the
				minimum width and the larger number is the maximum width eligible for federal
				or state project participation.
***Bridges in design class L4 or L5 having a total length over
				100 feet may be designed with a clear width of 30 feet.