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Brian Deegan - GB Cycle Embassy Infrastructure Summit 2015


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22 little things and 1 big one
An overview of the finer points of getting cycle infrastructure right, in a UK context informed by experience in London.

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Brian Deegan - GB Cycle Embassy Infrastructure Summit 2015

  1. 1. 22 little things and 1 big one Brian Deegan
  2. 2. 1.Right left, left right • When route planning look for dog leg alignments where cyclists turn right from minor to major and left from major to minor. • We ride on the left so this works!
  3. 3. 2. Positioning shall be the whole of the law 1. I am on the route and the route goes that way 2. Hey other people, expect to see cyclists 3. This is the recommended position in the carriageway to take
  4. 4. 3. Lanes mean nothing without parking restrictions
  5. 5. 4. At signal junctions, the method of control is everything • Highway engineers deal with space, traffic engineers deal with time • Don’t just think about the space you are getting think about the time
  6. 6. 5. If a scheme has a critical issue then the score means nothing 0 100 70 40 - Dutch - Danish - German - UK Cycling infrastructure performance scale
  7. 7. 6. Collision risk is not the same as feeling safe
  8. 8. 7. Start with the nodes and the links will take care of themselves
  9. 9. 8. Parallel crossings have restricted movements. Toucans don’t.
  10. 10. 9.Does the design address the objectives • Collision reduction • Economic regeneration • Safe routes to school cycling • Speed reduction • Air quality Or is it just a standard approach?
  11. 11. 10. Vertical traffic calming is not the only fruit
  12. 12. 11. Cycle tracks are bad • Protected lanes are good
  13. 13. 12. Know the laws of signals • Thou shalt not have conflicting movements (unless it’s a right turn then that’s fine) • Thou shalt not exceed capacity as this is the definition of gridlock • Thou shalt minimise the number of stages • Thou shalt have as short a cycle time as possible (
  14. 14. 13. Policy should lead to practice “pedestrians at the top, followed by cyclists then public transport, with unaccompanied private car-users last.” - DfT
  15. 15. 14.Drainage bites
  16. 16. 15. Two way tracks need special care • At side roads, signal junctions, start and ends • +ve: maintenance, tidal flow overtaking • Roads for cycle traffic
  17. 17. 16.Risk equals severity times likelihood • So don’t be compromised by what ifs
  18. 18. 17. Stay positive but know the risks • Innovation and change needs a positive force behind it
  19. 19. 18. Don’t get out of bed unless you can work out degree of saturation 1. Saturation flow a) Measure time between 4 and 10 cars passing stop line then divide by 6 =______(seconds) a) Convert to number of vehicles per hour 3600/time =_______(vehicles per hour) 2. Capacity a) (green time for arm measured divided by entire cycle time) times saturation flow =___(vehicles per hour) 3. Degree of saturation a) Work out the actual flow for an hour period (15min x 4) = __214_(vehicles per hour) a) Divide actual flow by Capacity= Degree of Saturation = _____
  20. 20. 19. 99% of all problems can be solved with traffic management
  21. 21. 20. Sound is the best indicator of a great urban cycling route
  22. 22. How Quiet is your Quietway? Extract from LCDS – Cycling Level of Service Basic Good Highest
  23. 23. Noise level from recommended riding range 0 >78DB, 65-78DB,<65DB Source: Calculation of road traffic noise
  24. 24. Sound calculation •Let’s work out the sound from a flow (q) of 500 vehicles per two way peak hour flow
  25. 25. Basic noise 69db
  26. 26. Basic noise (18 hour) Q is approximately 10 times q so Q = 5000 and basic noise across 18hours is 66db
  27. 27. Correction for HGV’s Let’s say percentage of HGV’s is 5% So correction is -1.5db So 64.5db
  28. 28. Basic noise (18 hour) Let’s say gradient = 3% So correction is +1db So 65.5db
  29. 29. Correction for distance from carriageway Cyclists are right in the mix so +1db so 66.5db
  30. 30. Correction for ground absorbtion No impact on cyclists if on carriageway but important if they are running behind a verge on a busy road So 66.5db
  31. 31. So low flow, low HGV percentage, shallow gradient = a quiet route Therefore Quietness is a good indicator of pleasant cycling conditions Basic Good Highest 66.5db good 1point
  32. 32. 21. Big things entice, little things protect
  33. 33. Conversion of food into propulsive force via the crank shaft Design interventions Heat loss to muscles and environment Bicycle efficiency, ability to maintain speed Bicycle speed range 0 – 83mph Road surface & Rolling resistance Acceleration Gradient Air resistance Mass of rider and bicycle and effect of gravity Manufacturer improvements Smooth surfacing eg. SMA Avoid stop/start Provide less steep alternatives Avoid exposure Reduce area 22. Design to reduce effort
  34. 34. 1. Protected junction progress