execute @e[type=mca:mca_car,c=1,tag=mt1] ~ ~ ~ summon ats:right
execute @e[type=mca:mca_car,c=1,tag=mt1] ~ ~ ~ execute @e[type=mca:mca_car,c=1,r=26,tag=mt2] ~ ~ ~ summon ats:right
execute @e[type=mca:mca_car,c=1,tag=mt3] ~ ~ ~ summon ats:left
execute @e[type=mca:mca_car,c=1,tag=mt3] ~ ~ ~ execute @e[type=mca:mca_car,c=1,r=26,tag=mt2] ~ ~ ~ summon ats:left