Roads in one command 1.12+

summon falling_block ~ ~1 ~ {Block:stone,Time:1,Passengers:[{id:falling_block,Block:redstone_block,Time:1,Passengers:[{id:falling_block,Block:activator_rail,Time:1,Passengers:[{id:commandblock_minecart,Command:gamerule commandBlockOutput false},{id:commandblock_minecart,Command:fill ~2 ~-3 ~-2 ~8 ~-1 ~2 stained_hardened_clay 11 hollow},{id:commandblock_minecart,Command:fill ~2 ~-2 ~-2 ~8 ~-2 ~2 stained_glass 7 0 stained_hardened_clay},{id:commandblock_minecart,Command:setblock ~1 ~-3 ~ wall_sign 4 0 {Text1:"{\\\"text\\\":\\\"\\\",\\\"clickEvent\\\":{\\\"action\\\":\\\"run_command\\\",\\\"value\\\":\\\"/tellraw @p [\\\\\\\"\\\\\\\",{\\\\\\\"text\\\\\\\":\\\\\\\"the road will spawn in the direction you are looking.\\\\\\\",\\\\\\\"color\\\\\\\":\\\\\\\"green\\\\\\\"}]\\\"}}",Text2:"{\\\"text\\\":\\\"Get items/Info\\\",\\\"clickEvent\\\":{\\\"action\\\":\\\"run_command\\\",\\\"value\\\":\\\"give @p minecraft:spawn_egg 1 0 {EntityTag:{id:minecraft:bat,NoAI:1,CustomName:Road},display:{Name:Road}}\\\"}}",Text3:"{\\\"text\\\":\\\"\\\",\\\"clickEvent\\\":{\\\"action\\\":\\\"run_command\\\",\\\"value\\\":\\\"give @p minecraft:spawn_egg 1 0 {EntityTag:{id:minecraft:bat,NoAI:1,CustomName:RoadMid}}\\\"}}",Text4:"{\\\"text\\\":\\\"\\\"}"}},{id:commandblock_minecart,Command:setblock ~1 ~-2 ~ wall_sign 4 0 {Text1:"{\\\"text\\\":\\\"\\\"}",Text2:"{\\\"text\\\":\\\"Remove\\\"}",Text3:"{\\\"text\\\":\\\"\\\"}",Text4:"{\\\"text\\\":\\\"\\\",\\\"clickEvent\\\":{\\\"action\\\":\\\"run_command\\\",\\\"value\\\":\\\"fill ~ ~-1 ~-2 ~7 ~1 ~2 air\\\"}}"}},{id:commandblock_minecart,Command:fill ~3 ~-2 ~-1 ~7 ~-2 ~1 chain_command_block 5},{id:commandblock_minecart,Command:setblock ~7 ~-2 ~1 chain_command_block 1},{id:commandblock_minecart,Command:setblock ~3 ~-2 ~ chain_command_block 3},{id:commandblock_minecart,Command:fill ~7 ~-2 ~ ~4 ~-2 ~ chain_command_block 4},{id:commandblock_minecart,Command:setblock ~7 ~-2 ~-1 chain_command_block 3},{id:commandblock_minecart,Command:setblock ~3 ~-2 ~-1 repeating_command_block 5},{id:commandblock_minecart,Command:blockdata ~7 ~-2 ~1 {auto:1,Command:kill @e[name=RoadMid]}},{id:commandblock_minecart,Command:blockdata ~6 ~-2 ~1 {auto:1,Command:/execute @e[name=RoadMid] ~ ~ ~ fill ~2 ~-1 ~2 ~-2 ~-1 ~-2 concrete 7}},{id:commandblock_minecart,Command:blockdata ~5 ~-2 ~1 {auto:1,Command:kill @e[name=Road]}},{id:commandblock_minecart,Command:blockdata ~4 ~-2 ~1 {auto:1,Command:execute @a[rym=220,ry=320] ~ ~ ~ /execute @e[name=Road,r=8] ~ ~ ~ fill ~5 ~-1 ~ ~6 ~-1 ~ concrete 4}},{id:commandblock_minecart,Command:blockdata ~3 ~-2 ~1 {auto:1,Command:execute @a[rym=220,ry=320] ~ ~ ~ /execute @e[name=Road,r=8] ~ ~ ~ fill ~1 ~-1 ~ ~2 ~-1 ~ concrete 4}},{id:commandblock_minecart,Command:blockdata ~3 ~-2 ~ {auto:1,Command:execute @a[rym=220,ry=320] ~ ~ ~ /execute @e[name=Road,r=8] ~ ~ ~ fill ~7 ~-1 ~2 ~ ~-1 ~-2 concrete 7}},{id:commandblock_minecart,Command:blockdata ~4 ~-2 ~ {auto:1,Command:execute @a[rym=45,ry=135] ~ ~ ~ /execute @e[name=Road,r=8] ~ ~ ~ fill ~-5 ~-1 ~ ~-6 ~-1 ~ concrete 4}},{id:commandblock_minecart,Command:blockdata ~5 ~-2 ~ {auto:1,Command:execute @a[rym=45,ry=135] ~ ~ ~ /execute @e[name=Road,r=8] ~ ~ ~ fill ~-1 ~-1 ~ ~-2 ~-1 ~ concrete 4}},{id:commandblock_minecart,Command:blockdata ~6 ~-2 ~ {auto:1,Command:execute @a[rym=45,ry=135] ~ ~ ~ /execute @e[name=Road,r=8] ~ ~ ~ fill ~-7 ~-1 ~2 ~ ~-1 ~-2 concrete 7}},{id:commandblock_minecart,Command:blockdata ~7 ~-2 ~ {auto:1,Command:execute @a[rym=320,ry=45] ~ ~ ~ /execute @e[name=Road,r=8] ~ ~ ~ fill ~ ~-1 ~5 ~ ~-1 ~6 concrete 4}},{id:commandblock_minecart,Command:blockdata ~7 ~-2 ~-1 {auto:1,Command:execute @a[rym=320,ry=45] ~ ~ ~ /execute @e[name=Road,r=8] ~ ~ ~ fill ~ ~-1 ~1 ~ ~-1 ~2 concrete 4}},{id:commandblock_minecart,Command:blockdata ~6 ~-2 ~-1 {auto:1,Command:/execute @a[rym=320,ry=45] ~ ~ ~ /execute @e[name=Road,r=8] ~ ~ ~ fill ~2 ~-1 ~7 ~-2 ~-1 ~ concrete 7}},{id:commandblock_minecart,Command:blockdata ~5 ~-2 ~-1 {auto:1,Command:/execute @a[rym=135,ry=220] ~ ~ ~ execute @e[name=Road,r=8] ~ ~ ~ fill ~ ~-1 ~-5 ~ ~-1 ~-6 concrete 4}},{id:commandblock_minecart,Command:blockdata ~4 ~-2 ~-1 {auto:1,Command:/execute @a[rym=135,ry=220] ~ ~ ~ execute @e[name=Road,r=8] ~ ~ ~ fill ~ ~-1 ~-1 ~ ~-1 ~-2 concrete 4}},{id:commandblock_minecart,Command:blockdata ~3 ~-2 ~-1 {auto:1,Command:execute @a[rym=135,ry=220] ~ ~ ~ /execute @e[name=Road,r=8] ~ ~ ~ fill ~2 ~-1 ~-7 ~-2 ~-1 ~ concrete 7}},{id:commandblock_minecart,Command:setblock ~ ~ ~1 command_block 0 0 {Command:fill ~ ~-3 ~-1 ~ ~ ~ air}},{id:commandblock_minecart,Command:setblock ~ ~-1 ~1 redstone_block},{id:commandblock_minecart,Command:kill @e[type=commandblock_minecart,r=1]}]}]}]}