Résumé Odile Coppey et Sarah Labelle analysent ici, sur la base d’une observation participante, un dispositif de publication et d’échanges mis en place dans le cadre du projet de modernisation de l’administration, puis abandonné. Elles étudient la façon dont se rencontrent autour d’un tel projet les enjeux de l’écriture dans l’espace public et les imaginaires politiques et managériaux d’une communication participative. Analysant précisément l’écart entre les idéaux mobilisés par un tel projet et les difficultés réelles qu’a rencontrées sa mise en œuvre, elles montrent que l’étude de ces entreprises médiatiques « participatives » rend lisibles les contradictions qui traversent aujourd’hui la pensée communicationnelle du politique.

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The results of two surveys of arriving and departing air travelers at O'Hare and Midway airports in Chicago concerning their choice of ground access and egress modes are reported. The purpose of the surveys was to better understand the travelers' trip purpose, trip frequency, origin and destination location, and perception of rail rapid transit as an access mode, so that promotional programs can be developed to increase this transit use. For both airports, about 15 percent of all air travelers whose ground trip-ends fell within the Chicago Transit Authority’s (CTA’s) service area used rail transit for access and egress. Rail access has been provided to O'Hare (Northwest Corridor, Blue Line) since 1984 and to Midway (Southwest Corridor, Orange Line) since 1993. The CTA has undertaken targeted promotional campaigns to increase the overall diversion of automobile travelers in both corridors to rapid transit. Such improved access to the airport increases the potential for greater market penetration. Passenger characteristics and survey methods are summarized, and the two ground access surveys are compared. The importance of express transit service as a significant consideration for managers and designers of major airports is highlighted.

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