The sound intensity of street traffic is about 107 times greater than the threshold of hearing. what is the relative intensity of street traffic? use the formula

From the information, the sound intensity of street traffic is about 10^7 greater than the threshold of hearing.
Therefore; if the threshold of hearing is 1 then the street traffic is 10^7 times greater. Sound intensity is the sound power per unit area (W/m²), a sound energy quantity, the SI units are Watts/square meter. Sound intensity level in decibels is ten times the logarithm of the ratio of the sound intensity to the reference sound intensity of 1 pico watt/m²
Hence; the intensity level is LI = 10 × log (10 ^7)/1) dB
                  = 70 dB greater than the threshold of hearing at 0 dB
 Thus the relative intensity of street traffic is 70 decibels.