N WHY ROUNDABOUTS? N a a t t i i o o n n a a
WHY NOT SIGNALS, 2 WAY, l l
R R o o u u n n d OR 4 WAY STOPS? d a a b b o o u u t t
C C o o n n f f e e r r e e n n c c e e
2 2 0 0 0 0 5 5
D D R R A A F F T T WHY ROUNDABOUTS? N N a a t t i i o o n n a Safest At-Grade Intersection Possible a l l
R R o o u u n n d High Capacity / Low Delay d a a b b o o u u t t
C Good for All Modes of Traffic C o o n n f f e e r r e Geometric Flexibility e n n c c e e
2 2 0 Aesthetics 0 0 0 5 5
D D R R A A F F T T N Crash Reduction - Roundabouts N a a t t i i o o n n a a l (NYSDOT SPR C-01-47) l
• Real world – variability R R o o u u n n d d a a b b o o u u t t
C C o o n n f f e e r r e e n n c c e e
2 2 0 0 0 0 5 5
D D R R A A F F T T Natiionall Roundabout Conference 2005 DRAFT Top Ten Crash Fatality States N N a a t t i i o o n n a a l l
R R o o u u n n d d a a b b o o u u t t
C C o o n n f f e e r r e e n n c c e e
2 2 0 0 0 0 5 5
D D R R A A F F T T States Actively Progressing Roundabouts N N a a t t i i o o n n a a l l
R R o o u u n n d d a a b b o o u u t t
C C o o n n f f e e r r e e n n c c e e
2 2 0 0 0 0 5 5
D D R R A A F F T T Crash Reduction – Shoulder N N a a t t i Widening i o o n n a a l l
R • Widen shoulder from 0-8 ft (FHWA-RD-91-046) R o o u u n n d 60 d a a b b o o u 50 u t t
C C o o n n
on 40 i f f t e e r r e e duc e n 30 n r c t c n e e e
c 2 r 2 e 0
20 0 P 0 0 5 5
D 10 D R R A A F F
0 T T est. % reduction related est. % reduction total accidents accidents N Crash Reduction – Rumble Strips N a a t t i i o o n n a a l l
R (FHWA-RD-00-032) R o
• Rumble strip crash reduction o u u n n d 20 d a a b b
18 o o u u t 16 t
C C o 14 o on n n i t f f e 12 e r r duc e e e n
10 n r t c c n e e e 8 c
r 2 2 0 0
pe 6 0 0 5 4 5
D D R 2 R A A F 0 F T est. % reduction in ROR est. % reduction in total T crashes crashes N Crash Reduction – Turn Lanes N a a t t i i o o n n a a l l
R • Add major road right turn and left turn lanes at 4- R o o u u n (FHWA-RD-02-103) n
legged urban signalized intersection d d a a b b o o u 30 u t t
C C o o
25 n n f f e e n r r o e i e t 20 n n c c c u e e d
2 15 2 re 0 0 t 0 n 0 e 5 5
10
rc D D e R R p A 5 A F F T T 0 est. % reduction in intersection related crashes N Crash Reduction - Roundabout N a a t t i i o o n n a a l l
R • Conversion of existing intersection to R o o u u n n d small/moderate sized roundabout (FHWA-RD-00-067) d a a b b o o u 80 u t t
C 70 C o o n n f
60 f e e r r e e
on 50 i n n t c c e 40 e duc
e 2 2 r 0
30 0 % 0 0 5 20 5
D D R 10 R A A F 0 F T est. % reduction for est. % reduction for T small/moderate small/moderate roundabout total crashes roundabout imjury crashes RED LIGHT RUNNING CAMERA N N a a t t i i o o n n a a l l
R R o o u u n n d d a a b b o o u u t t
C C o o n n f f e e r r e e n n c c e e
2 2 0 0 0 0 5 5
D D R R A A F F T T 40 MPH T-BONE CRASH N N a a t t i i o o n n a a l l
R R o o u u n n d d a a b b o o u u t t
C C o o n n f f e e r r e e n n c c e e
2 2 0 0 0 0 5 5
D D R R A A F F T T Natiionall Roundabout Conference 2005 DRAFT Natiionall Roundabout Conference 2005 DRAFT South Golden Road - Golden, CO - Before N N a a t t i i o o n n a a l l
R R o o u u n n d d a a b b o o u u t t
C C o o n n f f e e r r e e n n c c e e
2 2 0 0 0 0 5 5
D D R R A A F F T T Ulysses Roundabout N N a a t t i i o o n n a Commercial Access a l l
R R o o u u n n d d a a b b o o u u t t
C C o o n n f f e Commercial Access e r r e e n n c c e e
2 2 0 0 0 0 5 5
D D R R A A F F T T
Johnson Road Roundabout South Golden Road - Accident History N N a a t t i i o
Before and After Roundabouts o n n a a l l
R R o o
3 Years 28 Months u u n n d Prior After % Change d a a b b o o u u t
Total accidents 158 84 t
C C o o n n f f e Accidents Per month 4.39 3 -31.66% e r r e e n n c c e Accidents Per Million Miles 9.1 3.6 -60.44% e
2 2 0 0 0 0 5 Injuries total 31 1 5
D D R R A A F Injuries Per month 0.86 0.04 -95.85% F T T
Injuries Per Million Miles 1.6 0.09 -94.38% Natiionall Roundabout Conference 2005 DRAFT Natiionall Roundabout Conference 2005 DRAFT WASHINGTON STATE ROUNDABOUT N N a a t t i i o o n n a a l l
R R o o u u n n d d a a b b o o u u t t
C C o o n n f f e e r r e e n n c c e e
2 2 0 0 0 0 5 5
D D R R A A F F T T WASHINGTON SAFETY RECORD N N a a t t i i o o n n a a l l
R R o o u u n n d d a a b b o o u u t t
C C o o n n f f e e r r e e n n c c e e
2 2 0 0 0 0 5 5
D D R R A A F F T T Pedestrian Consideration N N a a t t i i o o n n a Benefits: a l l
R R o o u Easy to determine gaps u n n d d a a b Cars only coming from one direction b o o u u t t
C Fewer lanes to cross C o o n n f f e e
Splitter Island provides refuge r r e e n n c c e e
Trade Offs: 2 2 0 0 0 0 5 Must assess gaps – This is the most difficult issue5
D D R R A NCHRP 3-78 will be addressing this topic A F F T No protected phase??? T Unless “All Red” Signals Provide N N a No “Protected” Pedestrian Phase a t t i i o o n n a a l l
R R o o u u n n d d a a b b o o u u t t
C C o o n n f f e e r r e e n n c c e e
2 2 0 0 0 0 5 5
D D R R A A F F T T “Queens Tot Tragedy” N N a a t t i i o o n n a a l l
R R o o u u n n d d a a b b o o u u t t
C C o o n n f f e e r r e e n n c c e e
2 2 0 0 0 0 5 5
D D R R A A F F T T Why Roundabouts Reduce Pedestrian Fatalities N Pedestrian’s Probability of Death if Hit by Cars N a a t t i i o o n n a a l l
R R o 85% o u u n n d d a a b b o o u u t t
C C o o n n f f e e r r e e n n c
45% c e e
2 2 0 0 0 0 5 5
D D R R A A F F T 15% T
32 km/hr 50 km/hr 65 km/hr 20 mph 30 mph 40 mph Natiionall Roundabout Conference 2005 DRAFT Natiionall Roundabout Conference 2005 DRAFT Natiionall Roundabout Conference 2005 DRAFT Natiionall Roundabout Conference 2005 DRAFT Pedestrians @ Great Neck – Long Island N N a a t t i i o o n n a a l l
R R o o u u n n d d a a b b o o u u t t
C C o o n n f f e e r r e e n n c c e e
2 2 0 0 0 0 5 5
D D R R A A F F T T One of NYSDOT Newest Signals N N a a t t i i o o n n a a l l
R R o o u u n n d d a a b b o o u u t t
C C o o n n f f e e r r e e n n c c e e
2 2 0 0 0 0 5 5
D D R R A A F F T T New NYSDOT Intersection Design Policy N N a a t t i i o o n n a a l l
R R o o u u n n d d a a b b o o u u t t
C C o o n n f f e e r r e e n n c c e e
2 2 0 0 0 0 5 5
D D R R A A F F T T N N a Contact Information a t t i i o o n n a a l l
R Howard McCulloch, R o o u u n Richard Schell, n d d a a b b
or Tom Kligerman o o u u t t
C C o o n n f f e
Roundabout Design Unit e r r e e n n
50 Wolf Road, POD 24 c c e e
2 2
Albany, New York 12232 0 0 0 0 5 5
D D R R A Tel: (518) 485-7503 A F F T Fax: (518) 457-0303 T E-mail: [email protected]