Basics of Urban Street Networks
Norman W. GarrickLecture 3.2
Impact of Street Network Design
Research shows that street network design can impact– Traffic safety– Choice of Mode– Vehicle Miles Travel– Health outcomes – Character and value of communities
versus
versus
Safety Impact
Risk of Severe Injury or Fatality*
Chance of being Severely Injured
30% HigherChance of being Killed
50% Higher *Given that an injury occurred
Impact on SafetyOdds of Dying in a Road Accident
based on Intersection Density*
1 in 200
1 in 500
*Given that an injury occurred
9%
2%
4%
1%
9%
2%
Impact on Mode ChoicePercentage of People Walking, Biking or Taking Transit
Impact on Mode ChoicePercentage of People Walking, Biking or Taking Transit
Effect of Intersection Density for Cul-de-sac Network
< 81 81-144 144-225 225+0%
5%
10%
Impact on Mode ChoicePercentage of People Walking, Biking or Taking Transit
Effect of Intersection Density for Gridded Network
< 81 81-144 144-225 225+0%
5%
10%
Guidelines for Street Network Design
A good street network should have
1. High DensityThe density can be measured by intersections per square miles or my block size or other related parameters
2. Good Connectivity at all geographic scales (from regional to neighborhood)Not all streets should be connected at all scales but the streets that connect region wide should be frequent (no more that
½ mile apart).
3. Great variety in streets typesThe street network should have streets that vary from very busy to very quiet, from mostly commercial to mostly
residential. In general, the busier streets should be the more commercial and the more regional. While the more residential streets should be shorter/more local.
4. No Restrictions on the types of streets that are connected to each otherFor example, small neighborhood streets should connect to big regional streets with no restrictions.
Prenzlauer Berg – Regional Context
Prenzlauer Berg – City Context
Prenzlauerberg
Berlin
The Streets of Prenzlauer Berg
Schoenhauser AlleeThe main street
Prenzlauer AlleeThe second main
street
PappelalleeA neighborhood shopping
street
RaumerstrasseA neighborhood shopping
street
Goehrener StrasseA residential street
Schoenhauser AlleeThe main street
Schoenhauser AlleeThe main street
Schoenhauser AlleeThe main street
Prenzlauer AlleeThe second main street
PappelalleeA neighborhood shopping
street
PappelalleeA neighborhood shopping
street
RaumerstrasseA neighborhood shopping
street
Greigenhagener Strassesimilar to Goehrener Strasse
A residential street
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