Wilfully speeding is a sin because the bible writes that if we “sin wilfully” after we know the truth, “there remaineth no more sacrifice for sins” but the awaiting of “judgement and fiery indignation”:
Hebrews 10:26-27 King James Version (KJV)
26 For if we sin wilfully after that we have received the knowledge of the truth, there remaineth no more sacrifice for sins,
27 But a certain fearful looking for of judgment and fiery indignation, which shall devour the adversaries.
For not knowing the speed limit, Jesus said that the blind “should have no sin”, but those who see the sin, or know the speed limit, say “we see”, and their “sin remaineth”:
John 9:41 King James Version (KJV)
41 Jesus said unto them, If ye were blind, ye should have no sin: but now ye say, We see; therefore your sin remaineth.
Jesus again affirms that it is only a sin once the person knows it, (in this case it is knowing the speed limit), through the quote “they had not had sin: but now they have no cloak for their sin”:
John 15:22 King James Version (KJV)
22 If I had not come and spoken unto them, they had not had sin: but now they have no cloak for their sin.
Speeding while not knowing the speed limit can still land you a ticket, because the passage below describes a servant that “knew not, and did commit things worthy of stripes” and was “beaten with few stripes”, yet the other servant who “knew his lord’s will”, (or in this case knew the speed limit), but “neither did according to his will, shall be beaten with many stripes”:
Luke 12:47-48 King James Version (KJV)
47 And that servant, which knew his lord’s will, and prepared not himself, neither did according to his will, shall be beaten with many stripes.
48 But he that knew not, and did commit things worthy of stripes, shall be beaten with few stripes. For unto whomsoever much is given, of him shall be much required: and to whom men have committed much, of him they will ask the more.