Table 2 Summary of the elements of the experimental and the active control arms

Material incentive

6 months of free transport and/or 6 months of free access to a classic or an electric bike

2 appointments with a programme implementer

First appointment: Discussion about the motivations to reduce car use, co-construction of a personalised mobility advice, mobility change goals setting, development of an action plan, prevention of obstacles to change mobility behaviour.

Second appointment: Evaluation and adaptation of change goals and resolution of obstacles

First appointment: Concept of air pollution, in-depth questions on pollution (sources of air pollution, health consequences, pollution levels in Grenoble metropolitan area), discussion about the association between air pollution and car use and discussion about the benefits and advantages of the frequent use of the car

Second appointment: Evaluation and discussion of the air quality and the identified pollution peaks

Notebook to be filled up

Goals notebook:

1. Setting new goals or adapting goals every two weeks

2. Taking notes of the experienced obstacles (if any) and looking for solutions

Observation notebook:

1. Taking note of the air pollution every two weeks

2. Taking note of the announced air pollution peaks (if any)

2 kinds of SMS

(1 SMS per week during the first 3 months and 1 SMS bimonthly during the last six months)

1. Prompting the Setting and the Adaptation of goals, action planning and, habit formation

2. Self-monitoring of positive consequences of mobility change (e.g., better physical state, feeling of well-being)

1. Taking notes of the air pollution indices and comments

2. Taking notes of the announced air pollution peaks and comments