Open access resources are accessible without any barriers, so the ROAD interface as well as the search and display functionalities take back some features accessible to subscribing users.
 

- ROAD search pages are limited to ISSN records describing open access resources,
 

- The results pages and the ISSN records are viewed from the ISSN portal,
 

- A ROAD logo indicates that the resource described is in open access.
 

- As a ROAD free user, you can access functionalities reserved to subscribing users:
 

• cartographic search at the level of the city of publication,
   
• advanced search with 17 indexes, notably by type of open access resource, instead of the basic 4 indexes available for free users,
   
• complete ISSN records, because these records describe and give access to open access resources.
   

[See also section 3.3. How to use the advanced search?]