Who can hear Fourvière at noon?

The map shows a "sound isochrone" of the Fourvière carillon in Lyon. Blue contour lines give the time the sound arrives: about 3.6 s at the Hôtel de Ville and 8.5 s at Part-Dieu. Blue shaded areas mark where the carillon can be heard above the midday traffic, and dotted lines mark where the sound arrives but is drowned out by traffic. Beyond 1.5 km, traffic covers the carillon in 7 streets out of 8. The calculation assumes a 115 dB (±5 dB) carillon, a passerby at 1.6 m above ground, 15 °C and no wind, and accounts for buildings and terrain. Audibility is estimated optimistically, assuming no building blocks the sound.