Evaluate the similarity between them and classify them into classes from 0-5 as follows:
0 : The two sentences are completely dissimilar.
1 : The two sentences are not equivalent, but are on the same topic.
2 : The two sentences are not equivalent, but share some details.
3 : The two sentences are roughly equivalent, but some important information differs/missing.
4 : The two sentences are mostly equivalent, but some unimportant details differ.
5 : The two sentences are completely equivalent, as they mean the same thing.

Sentence 1: The man is riding a motorcycle down the road. Sentence 2: A man is riding a red motorcycle on the road.
4

Sentence 1: The woman is walking her dog. Sentence 2: A woman walks her dog down the street.
4

Sentence 1: At 5 p.m. EDT, Grace's center was near latitude 25.6 north, longitude 93.7 west or about 280 miles east-southeast of Corpus Christi. Sentence 2: At 11 a.m. EDT, Fabian's center was near latitude 18.1 north and longitude 53.2 west, or about 550 miles east of the Leewards.

1