Signalling Three-Way Intersections: Is Redundancy Better Than Only Mandatory or Prohibitory Signs? Vargas, Cristina Moreno Ríos, Sergio Mental models Three-way intersections Mandatory sign Prohibitory sign Redundant information This work was supported by the Spanish Government, Ministry of Economy and Competitiveness (PGC2018-095868-B-I00). At intersections, drivers need to infer which ways are allowed by interpreting mandatory and/or prohibitory traffic signs. Time and accuracy in this decision-making process are crucial factors to avoid accidents. Previous studies show that integrating information from prohibitory signs is generally more difficult than from mandatory signs. In Study 1, we compare combined redundant signalling conditions to simple sign conditions at three-way intersections. In Study 2, we carried out a survey among professionals responsible for signposting to test whether common practices are consistent with experimental research. In Study 1, an experimental task was applied (n = 24), and in Study 2, the survey response rate was 17%. These included the main cities in Spain such as Madrid and Barcelona. Study 1 showed that inferences with mandatory signs are faster than those with prohibitory signs, and redundant information is an improvement only on prohibitory signs. In Study 2, prohibitory signs were those most frequently chosen by professionals responsible for signposting. In conclusion, the most used signs, according to the laboratory study, were not the best ones for signposting because the faster responses were obtained for mandatory signs, and in second place for redundant signs. 2021-12-03T11:21:33Z 2021-12-03T11:21:33Z 2021-10-26 info:eu-repo/semantics/article Vargas C and Moreno-Ríos S (2021) Signalling Three-Way Intersections: Is Redundancy Better Than Only Mandatory or Prohibitory Signs? Front. Psychol. 12:712102. doi: [10.3389/fpsyg.2021.712102] http://hdl.handle.net/10481/71881 10.3389/fpsyg.2021.712102 eng http://creativecommons.org/licenses/by/3.0/es/ info:eu-repo/semantics/openAccess Atribución 3.0 España Frontiers Research Foundation