InterMob: a Randomized Controlled Trial Aimed at Reducing Car Use in Regular Car Users

NCT05096000 | Enrolling By Invitation

• 1 other identifier: INTERMOBFRUGA
• Study Type: interventional
• Target: 400
• Locations: 1 country
• Sites: 1

Brief Summary

Regular car use is a source of pollution and physical inactivity. InterMob is an interdisciplinary randomized controlled behavioral intervention aiming at reducing car use. The objectives of InterMob are to a) Evaluate the efficacy of a theory- and evidence-based intervention, b) Identify the mechanisms related mobility change, and c) Identify the conditions under which the intervention is effective. To meet these objectives, 300 regular car users living in Grenoble will be recruited and randomized in one of two arms:

1. 1.experimental group that will receive the InterMob intervention: six months of free public transport/access to a bicycle, and behavior change techniques (personalized transport advice, setting of mobility change goals, considering possible obstacles; 6 months of motivational messages to prompt goal setting and self-monitoring).
2. 2.active control group that will receive information about air pollution (discussion about the health consequences of air pollution, the association between air pollution and car use; 6 months of messages to prompt air pollution monitoring.) Follow-up measures will be carried out until 24 months after the beginning of the study (8-day measurement sessions). Five sessions will involve wearing a GPS/accelerometer, and an air pollution sensor. Participants will complete mobility logs and questionnaires measuring the psychological mechanisms related to their mobility (habits, intentions, self-efficacy), and socio-economical characteristics (number of children, accessibility) during the 8 sessions.

Conditions

Automobile Driving; Active Commuting

Keywords

Transportation; Active transportation; Sustainable transportation; physical activity; air pollution

Outcome Measures

Primary Outcomes (7)

• Changes in car use from the baseline and the beginning of the intervention (one month after the beginning of the intervention, Month 1)

  Car use (kilometers traveled and modal share) will be measured using the GPS tracks collected by a GPS device (SenseDoc) and by calculating the variables of interest from the information mentioned in the travel diary. The GPS device is used during 9 days each and the travel diary is filled up during 8 days

  Baseline and one month and a half after the baseline (Month 1)

• Changes in car use from the baseline and half of the intervention (Month 3)

  Car use (kilometers traveled and modal share) will be measured using the GPS tracks collected by a GPS device (SenseDoc) and by calculating the variables of interest from the information mentioned in the travel diary. The GPS device is used during 9 days each and the travel diary is filled up during 8 days

  Baseline, and three months after the baseline (Month 3)

• Changes in car use from the baseline the end of the intervention (Month 7)

  Car use (kilometers traveled and modal share) will be measured using the GPS tracks collected by a GPS device (SenseDoc) and by calculating the variables of interest from the information mentioned in the travel diary. The GPS device is used during 9 days each and the travel diary is filled up during 8 days

  Baseline and seven months after the baseline (Month 7)

• Changes in car use from the baseline and two months after the end of the intervention (Month 9)

  Car use (kilometers traveled and modal share) will be measured by calculating the variables of interest from the information mentioned in the travel diary. Travel diary is filled up during 8 days

  Baseline and nine months after the baseline (Month 9)

• Changes in car use from the baseline and six months after the end of the intervention (Month 12)

  Car use (kilometers traveled and modal share) will be measured by calculating the variables of interest from the information mentioned in the travel diary. Travel diary is filled up during 8 days

  Baseline and one year after the baseline (Month 12)

• Changes in car use from the baseline and one year after the end of the intervention (Month 18)

  Car use (kilometers traveled and modal share) will be measured using the GPS tracks collected by a GPS device (SenseDoc) and by calculating the variables of interest from the information mentioned in the travel diary. The GPS device is used during 9 days each and the travel diary is filled up during 8 days

  Baseline and one year and a half after the baseline (Month 18)

• Changes in car use from the baseline and one year and a half after the end of the intervention (Month 24)

  Car use (kilometers traveled and modal share) will be measured by calculating the variables of interest from the information mentioned in the travel diary. Travel diary is filled up during 8 days

  Baseline and two years after the baseline (Month 24)

Secondary Outcomes (82)

• Changes in active commuting (classic or electric bike, public transport, walk, carpooling) from the baseline and and the beginning of the intervention (one month after the beginning of the intervention, Month 1)

  Baseline and one month and a half after the baseline (Month 1)

• Changes in active commuting (classic or electric bike, public transport, walk, carpooling) from the baseline and the half of the intervention (Month 3)

  Baseline, and three months after the baseline (Month 3)

• Changes in active commuting (classic or electric bike, public transport, walk, carpooling) from the baseline and the end of the intervention (Month 7)

  Baseline, and seven month after the baseline (Month 7)

• Changes in active commuting (classic or electric bike, public transport, walk, carpooling) from the baseline and two months after the end of the intervention (Month 9)

  Baseline, and nine months after the baseline (Month 9)

• Changes in active commuting (classic or electric bike, public transport, walk, carpooling) from the baseline and six months after the end of the intervention (Month 12)

  Baseline, and one year after the baseline (Month 12)

Other Outcomes (13)

• Reach of the intervention

  During the recruitment and enrollement, an average of 2 years

• Quality of the implementation

  During the implementation of the intervention, an average of 2 years

• Travel satisfaction

  Baseline

Study Arms (2)

InterMob: a behavioral and economical intervention

EXPERIMENTAL

* 6 months of free transport/bicycle (12.5 Adding objects in the BCT, Michie et al., 2011) * Two meetings with a coach : 1. st meeting: discussion about the motivations to change (motivational interviewing and 5.2 Salience of consequences, BCT), personalized advice of transport (4.1 Instruction on how to perform the behavior, BCT), mobility change goals, and action planning (1.1 Goal setting and 1.4 Action planning, BCT), solutions to possible obstacles (1.2 Problem solving, BCT) 2. nd meeting: discussion about the goals and the obstacles lived and resolved. If needed, personalized transport advice is given. * "Goals notebook" to fill up for 6 months (goals need to be set every 2 weeks and obstacles if experienced) * Weekly SMS during 6 months, prompting a) to set and adapt goals (1.7 Review outcome, BCT) and b) to do a self-feedback related to mobility change (e.g. a more important well-being) (2.4 Self-monitoring of outcomes, BCT's taxonomy)

Behavioral: InterMob: a randomized controlled trial aimed at reducing car use in regular car users

Air pollution information: an informational group

OTHER

Active control group focused on air pollution information: * Two meetings with a coach: 1. st meeting: Discussion about air pollution (definition, sources, population most affected, levels in Grenoble, the consequences on health, pollution peaks), air pollution and car use (video about the pollution exposure of car drivers and the consequences of fine particles) and, a discussion about the benefit and disadvantages of using a car (5.2 Salience of consequences according to BCT's taxonomy) 2. nd meeting: Discussion about air quality during the last weeks and they check the quality of air of the last week. * "Observation notebook" to fill up for 6 months (quality of air in Grenoble and the pollution peaks every 2 weeks) * Weekly SMS during 6 months prompting a) to write down the air quality of the air every two weeks and b) write down any pollution peak announced in the television/radio/telephone

Other: Active control: Air pollution information

Interventions

InterMob: a randomized controlled trial aimed at reducing car use in regular car users BEHAVIORAL

Intermob is a theory- and evidence-based behavioral intervention that combines public transport/bicycle and motivational techniques (action planning, personalized transport advice, goal setting).

InterMob: a behavioral and economical intervention

Active control: Air pollution information OTHER

The active control intervention is based on a discussion about air pollution, the effects of air pollution on health, the association between air pollution and transport.

Air pollution information: an informational group

Eligibility Criteria

• Age: 18 Years+
• Sex: all
• Healthy Volunteers: Yes
• Age Groups: Adult (18-64), Older Adult (65+)

You may qualify if:

• Profile: employed / unemployed / retired / on work-study or apprenticeship
• If employed : Work and live in the SMAAG territory (Metropole of Grenoble + Grésivaudan + Pays voironnais)
• If in apprenticeship/training program: Working, studying and living in the SMAAG territory (Metropole of Grenoble + Grésivaudan + Pays voironnais)
• If unemployed / retired : Reside in the SMAAG territory (Metropole of Grenoble + Grésivaudan + Pays voironnais)
• The car/motorcycle/scooter is the main mode of travel during the week (excluding weekends)
• Travels 3, 4, or 5 days by car (excluding weekdays)
• Thinks about reducing car use or has started to reduce car use - Expect to live and work in the Grenoble area in the next 2 years (Very likely and likely options)

You may not qualify if:

• Being a student
• Living outside the Metropole of Grenoble + Grésivaudan + Pays voironnais
• Working outside (Metropole of Grenoble + Grésivaudan + Pays voironnais)
• Studying outside (Metropole of Grenoble + Grésivaudan + Pays voironnais)
• Car/motorcycle/scooter is not the main mode of travel
• Travels 0, 1 or 2 days a week by car
• Does not intend to reduce the frequency of car use
• Does not expect to live and/or work in the Grenoble area in the next 2 years

Sponsors & Collaborators

• Aina Chalabaev: lead
• IDEX - Univ. Grenoble-Alpes: collaborator
• Région Auvergne-Rhône Alpes: collaborator
• Institut de Recherche en Santé Publique, France: collaborator
• ADEME: collaborator
• Institut National de la Santé Et de la Recherche Médicale, France: collaborator
• Métropole Grenoble-Alpes: collaborator

Study Sites (1)

Univ. Grenoble-Alpes

Saint-Martin-d'Hères, Auvergne-Rhône-Alpes, 38400, France

Location

Related Publications (1)

• Teran-Escobar C, Duche S, Bouscasse H, Isoard-Gatheur S, Juen P, Lacoste L, Lyon-Caen S, Mathy S, Ployon E, Risch A, Sarrazin P, Slama R, Tabaka K, Treibich C, Chardonnel S, Chalabaev A. InterMob: a 24-month randomised controlled trial comparing the effectiveness of an intervention including behavioural change techniques and free transport versus an intervention including air pollution awareness-raising on car use reduction among regular car users living in Grenoble, France. BMC Public Health. 2022 Sep 16;22(1):1763. doi: 10.1186/s12889-022-14099-4.

  PMID: 36114537 DERIVED

MeSH Terms

Conditions

Motor Activity

Condition Hierarchy (Ancestors)

Behavior

Study Officials

• Aïna Chalabaev, Professor

  Laboratoire SENS, Univ. Grenoble-Alpes

  STUDY DIRECTOR

Study Design

• Study Type: interventional
• Phase: not applicable
• Allocation: RANDOMIZED
• Masking: DOUBLE
• Who Masked: PARTICIPANT, OUTCOMES ASSESSOR
• Masking Details: Neither the participants nor the outcomes assessors will know the intervention in which each participant is assigned to.
• Purpose: PREVENTION
• Intervention Model: PARALLEL
• Sponsor Type: OTHER
• Responsible Party: SPONSOR INVESTIGATOR
• PI Title: Professor

Study Record Dates

• First Submitted: September 22, 2021
• First Posted: October 27, 2021
• Study Start: September 21, 2021
• Primary Completion: September 30, 2024
• Study Completion: September 30, 2025
• Last Updated: June 27, 2024

Record last verified: 2024-06

Data Sharing

• IPD Sharing: Will share
• Shared Documents: STUDY PROTOCOL, SAP, ICF, CSR, ANALYTIC CODE
• Time Frame: Study Protocole and informed consent form will be available in 2021, the clinical study report and the analytic code will be available after the end of the study (in 2025 or 2026)
• Access Criteria: Study protocole preprint, informed consent form, clinical study report preprint and analytic code will be available on OSF platform for everybody

Locations

FR (1)