The act of estimating the cognitive load 12 on the driver may alternatively include {HEAD ~ other suitable methods} to combine {TAIL ~ the collected values} 
to combine
The act of estimating the cognitive load 12 on the driver may alternatively include { HEAD ~ other suitable methods } to combine { TAIL ~ the collected values }
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD REL REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL