HomeMy WebLinkAboutRoad Design power pointSelected Information From Relevent Design Manuals Related to Street Design
AASHTO: American Association of State Highway and Transportation Officials - "A Policy on Geometric Design of Highways and Streets"
* "Guide for the Development of Bicycle Facilities - Fourth Edition"
ITE: Institute of Transportation Engineers - "Designing Walkable Urban Thoroughfares: A Context Sensitive Approach"
NACTO: National Association of City Transportation Officials - "Urban Street Design Guide"
** "Urban Bikeway Design Guide - Second Edition"
SUDAS: Statewide Urban Design and Specifications - "Design Guide"
Proposed
AASHTO
ITE
NACTO
SUDAS
Preferred
Allowed
Lane Width
10'
11'
9'- 12'
10'- 12'
101-11,
10'- 12'
Min. 11' lane for transit
Min. 11' lane for curbside bus
lane
Curb Offset
1.5'
0'
1' - 2' preferred
Limited information
Limited information
2' - 3' preferred
0' allowed
1.5' - 2' acceptable
Edge Zone: 1.5' minimum
Strict clear zone or minimum
Object Sectback: 3' preferred,
Clear Zone/Edge
6' (>25 mph) / 3'
As many clear -zone concepts as
offset not required
1.5' acceptable
Zone
(25 mph or less)
1.5'
practical
2' buffer behind curb
Clear Zone: 8' - 10' preferred,
recommended
5.5' - 7' acceptable
Curb Radius
10' Paved
25' Unpaved
5' to 50'
10'- 30'
10' - 15' standard
15'- 30' or more
10' to 15' typical
Target Speed = Design Speed =
Design speed >_ (posted speed +
Design Speed
25 mph
25 mph
20 - 30 mph (local)
25 to 35 mph
Posted Speed
5 mph) preferred
>_ 30 mph (collector)
35 mph max. (arterial)
30 - 60 mph (arterial)
30 mph max. (collector/local)
Design speed = posted speed
acceptable
On -Street Parking
8'
7'
T- 11'
T- 8'
T- 9'
8' - 10' preferred
7.5'- 10' acceptable
Street Trees
9'
6'
8' preferred
Limited information
Street trees acceptable
Street trees allowed
Parkway Width
5' allowed
Supportive of street trees
Bike Lane Width
6'
S'
* 5' preferred
6' recommended
** 6' desired minimum
5' preferred
5' minimum
Sidewalk
6'
S'
Limited information
G to 10'
5'- 12'
S' preferred
10'
8'
Supportive of sidewalks
4' minimum
(1 side - arterial)
(1 side -arterial)
AASHTO: American Association of State Highway and Transportation Officials - "A Policy on Geometric Design of Highways and Streets"
* "Guide for the Development of Bicycle Facilities - Fourth Edition"
ITE: Institute of Transportation Engineers - "Designing Walkable Urban Thoroughfares: A Context Sensitive Approach"
NACTO: National Association of City Transportation Officials - "Urban Street Design Guide"
** "Urban Bikeway Design Guide - Second Edition"
SUDAS: Statewide Urban Design and Specifications - "Design Guide"