The SIRE+ Project, builds upon the SIR and EMOTION-7 work methods and expertise to rectify a problem regarding opposite pilot responses to “Adjust vertical speed, adjust (AVSA) RAs. The solution proposed to address the issue is a simplification of TCAS RA design by replacing the current four AVSA RAs by a single “Level-off, level-off (LOLO) RA. The result is thus a single RA indication associated to a single aural message and requiring a single action from the pilot. The LOLO solution is implemented through the inclusion of CP115 into the TCAS MOPS. The evaluation of CP115 through simulations has demonstrated that it provides substantial safety benefits and improves risk ratios in all the situations that have been investigated. This EUROCONTROL project was conducted by Sofréavia with the support of DSNA.