Wis. Admin. Code Trans § Trans 205.03

Current through November 25, 2024

Section Trans 205.03 - County trunk highway standards

(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Note: Chapter Trans 76 was repealed.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.

Wis. Admin. Code Department of Transportation Trans 205.03

Cr. Register, December, 1986, No. 372, eff. 1-1-87.