INTERSECTION DESIGN. Bicycle Facility Workshop Intersections 4-1

Transcription

1 INTERSECTION DESIGN 4-1

2 Intersections Avoid unusual conflicts Provide direct path for cyclists, close to that of motor vehicles Bicyclists should be visible; their movements should be predictable Simple right angles best for bicyclists 4-2

3 Bigger isn t always better Albuquerque NM 4-3

4 Albuquerque NM 4-4

5 Albuquerque NM 4-5

6 Compact urban intersections are better Philadelphia PA 4-6

7 Skew decreases driver s ability to see cyclists 4-7

8 Right angle increases visibility 4-8

9 Shallow angle/poor visibility not good for cyclists Honolulu HI 4-9

10 Driver relies on rear-view mirror to see traffic Honolulu HI 4-10

11 Bicycle Detection at Signals This figure indicates where cyclists should wait in order to actuate the signal 5-11

12 Loop detector in bike lane detects cyclists 4-12

13 MUTCD standard for signal loop marking for bicyclists (Section 9C.05) 5-13

14 Loop detector in travel lane with cyclist stencil Portland OR 4-14

15 Good advice: Lean for the green 4-15

16 Not good: Requires dismounting Better: Push button close to curb What about ped-style push buttons for cyclists? 4-16

17 Summary of provisions for bicyclists at signals 4-17

18 Bike lane & right-turn lane channelization Always place bike lane to left of RTL to Separate conflicts Make bicyclists movements more predictable Take advantage of speed difference 4-18

19 Corvallis OR 4-19

20 Other scenario 1. RTL created by dropping parking 4-20

21 Corvallis OR 4-21

22 Corvallis OR 4-22

23 Corvallis OR 4-23

24 Other scenario 2. RTL created by dropping through lane In this case, bicyclists must move over across a lane to reach through bike lane 4-24

25 Bicyclists must cross a lane to reach through bike lane Portland OR 4-25

26 Bicyclists must cross a lane to reach through bike lane Portland OR 4-26

27 Portland OR 4-27

28 Place bike lane correctly even if it ends past intersection 4-28

29 A combined right turn lane and through bike lane is a reasonable compromise in constrained conditions Salem OR 4-29

30 Shared lane markings may ultimately be a better solution Cars will use the bike lane area when bicyclists are not there note the customized sign 4-30

31 Roundabouts: Making them work for bicyclists 4-31

32 A roundabout is a type of intersection control Clearwater FL 4-32

33 A roundabout is not: 1. A New England style rotary, with large size & high speeds Augusta ME 4-33

34 A roundabout is not: 2. A Washington DC style circle, with traffic signal controls Washington DC 4-34

35 A roundabout is not: 3. A traffic-calming mini circle Portland OR 4-35

36 A roundabout is not: 4. Paris Paris FR 4-36

37 Why roundabouts are safer for all users: Slow speed: Deflection, truck apron, splitter islands, reverse super Reduced conflicts No left turns Yield on entry CRF (all users): About 54% overall 27% pedestrian crashes Up to 76% fatals and serious injuries Clearwater FL 4-37

38 Essential roundabout characteristics Separated sidewalks direct peds to crosswalks Splitter island Slow speed exit Truck apron Crosswalk 1 car length back Lots of deflection = slow speeds throughout Slow speed entry = yield Bend OR 4-38

39 What does it take to make roundabouts work for bicyclists? Slow speeds lots of deflection; truck apron Simple, single lane, throughout Splitter islands Escape ramps for multi-lane roundabouts 4-39

40 Roundabouts: Designing to accommodate Bicyclists 4-40

41 End bike lane to encourage cyclist to enter roadway Bend OR 4-41

42 End bike lane to encourage cyclist to enter roadway Bend OR 4-42

43 Bend OR Slow speed allows cyclists to share roadway 4-43

44 Bend OR 4-44

45 Bend OR 4-45

46 Bend OR 4-46

47 Bend OR 4-47

48 What if a cyclist doesn t want to enter the roundabout? Bend OR 4-48

49 Bend OR 4-49

50 Bend OR 4-50

51 Questions? 4-51