brian deegan - gb cycle embassy infrastructure summit 2015
TRANSCRIPT
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22 little things and 1 big one
Brian Deegan
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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!
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2. Positioning shall be the whole of the law
1. I am on the route and the route goes that way2. Hey other people, expect to see cyclists3. This is the recommended position in the carriageway to take
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3. Lanes mean nothing without parking restrictions
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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
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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
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6. Collision risk is not the same as feeling safe
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7. Start with the nodes and the links will take care of themselves
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8. Parallel crossings have restricted movements. Toucans don’t.
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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?
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10. Vertical traffic calming is not the only fruit
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11. Cycle tracks are bad
• Protected lanes are good
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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
(
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13. Policy should lead to practice
“pedestrians at the top, followed by cyclists then public transport, with unaccompanied private car-users last.” - DfT
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14.Drainage bites
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15. Two way tracks need special care
• At side roads, signal junctions, start and ends• +ve: maintenance, tidal flow overtaking• Roads for cycle traffic
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16.Risk equals severity times likelihood
• So don’t be compromised by what ifs
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17. Stay positive but know the risks
• Innovation and change needs a positive force behind it
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18. Don’t get out of bed unless you can work out degree of saturation
1. Saturation flowa) Measure time between 4 and 10 cars passing stop line then divide by 6
=______(seconds)
b) Convert to number of vehicles per hour 3600/time
=_______(vehicles per hour)
2. Capacitya) (green time for arm measured divided by entire cycle time) times saturation flow
=___(vehicles per hour)
3. Degree of saturationa) Work out the actual flow for an hour period (15min x 4)
= __214_(vehicles per hour)
b) Divide actual flow by Capacity= Degree of Saturation
= _____
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19. 99% of all problems can be solved with traffic management
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20. Sound is the best indicator of a great urban cycling route
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How Quiet is your Quietway?
Extract from LCDS – Cycling Level of Service
Basic Good Highest
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Noise level from recommended riding range
0
>78DB, 65-78DB,<65DBSource: Calculation of road traffic noise
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Sound calculation
•Let’s work out the sound from a flow (q) of 500
vehicles per two way peak hour flow
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Basic noise
69db
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Basic noise (18 hour)
Q is approximately 10 times q so Q = 5000 and basic noise across 18hours is 66db
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Correction for HGV’s
Let’s say percentage of HGV’s is 5%
So correction is -1.5db
So 64.5db
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Basic noise (18 hour)
Let’s say gradient = 3%
So correction is +1db
So 65.5db
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Correction for distance from carriageway
Cyclists are right in the mix so +1db so 66.5db
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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
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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
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21. Big things entice, little things protect
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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 exposureReduce area
22. Design to reduce effort
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1. Protected junction progress