- THIS PAGE IS WORK IN PROGRESS*
In versions of the calculator before 3.5.0 the number of bicycles, and the cost of bicycles, looks implausible. This page documents the new approach:
The National Travel Survey 2012 reports:
- Table NTS0605 - The average distance traveled by bicycle per person in 2007 was 40 miles.
- Table NTS0608 - 42% of people aged 5+ owned a bicycle in 2011/12
- Table NTS0302 - 0.78% of non-air travel is by bicycle in 2012
- Table NTS0101 - 7103 miles travelled per person per year by all modes in 2007
COLBI - the European Bicycle Industry body - 2012 report on the European Bicycle Market  lists:
- Page 49 - 3771000 bicycles sold in GB in 2007, decreasing to 3600000 in 2012
- Page 50 - €725m value of bicycles sold in GB in 2007, increasing to €1098m in 2012.
- Page 21 - 2012 average bicycle price in GB €305, with NL highest at €724
The the british cycling economy report 2013 contains:
- 2010 3.6million bikes sold
- 2010 Bike sales of £1.6bn
- 2010 Accessory & service sales of £0.9m
42% of people over 5 own a bicycle, and the over 5 population in the UK is 59 million, so in 2011/12 there were about 25 million bikes in the UK. This means ownership as a % of total population is about 42% * 95% = 40%.
The average distance per bicycle must be, approximately, the average distance per person divided by bicycle ownership: 40 miles per person / 42% bikes per person = 100 miles / bike = 153 km / bike.
If we assume no growth, so that bicycle sales replace broken bicycles, then 25 million bikes owned / 3.7 million bikes sold = average life of a bicycle of 7 years.
The average cost of a bike today is £250 (=€305). The operating cost is £30/yr (=£0.8m accessory and service sales / 26 million bicycles)
What changes to 2050 as mode share changes
For the moment, we will leave the share of trips by Bicycle unchanged:
|Level||% of total passenger-km, including aviation|
Need to cross check whether this looks sensible against typical journey lengths and international comparisons.
Level 4: Lets assume that level 4 has 1 bicycle per person (roughly the case in the Netherlands)
In between, lets assume that bicycle ownership increases linearly with respect to increase in % of passenger km:
|Level||% passenger km by bike||% bike ownership||Person-km/yr||Person-km by bike/yr||Bike-km||Bike-km / day|
Assume that the cost range in 2050 goes from a high equal to the Netherlands £600 (=€724). Point estimate and low estimates are the same as today. (Note - another option would be to make the low equal to £160 (€190 the average selling price in Ireland) however, we decided to keep the lower level of £100 to give a bigger difference between high and low).
In any given scenario, assume that the ownership starts increasing from 2010.