Commercial bumper

Commercial bumpers are short segments to mark the start and the end of a commercial segment during a television show.

In Japan, it is called an eyecatch.

Initial D: First Stage
The bumpers of First Stage feature a red background with the word "Initial D" sliding on to the right, accompanied by someone saying "Initial D". Following the commercial break, it the same as the beginning, but with a blue background, accompanied by a sound of drums and a different guy saying the titular anime name, ending with a 3 note jingle and a warp sound. However, the BGM heard in the episode or Eurobeat is sometimes heard in the first eyecatch just as the guy says "Initial D". Most of the eye catches have a car rev synth sound in later episodes. Also in a few episodes, bumpers have a Eurobeat style jingle just as the guy says "Initial D!"

Initial D: Second Stage
The bumpers of Second Stage use 2 different bumpers between episodes. The first one starts in a red background as the words "Initial D" flip in from English to Japanese just as "Second Stage" is being written, accompanied by someone singing "Initial D". The ending bumper is the same but on a blue background, accompanied by a man saying "Initial D" along with the synth warp sound and a 5-note piano jingle. The second one is a black background with a car leaving the screen and the "Initial D" being in a different font, with the ending bumper being the car approaching the screen.

Initial D: Fourth Stage
In the first half of the Fourth Stage, an episode features the first word of the anime name sliding to the left in a flash background, with the capital "D" going downward right to form the titular anime name, with Project D in the bottom. The following episode is the same but has the word "PROJECT" instead of the first word of the anime sliding to the left as the eyecatch ends normal.

In the 2nd half of Fourth Stage, the word sliding sequence is the same between episodes, but the titular anime name flips to the right, with Project D sliding in. The sound effect featured is a sword drawing sound as the words are formed.

Initial D: Fifth Stage
The fifth season featured bumpers that showed the series' characters and their signature cars, depending on the episode of race sequence featured in, accompanied by the character saying "Initial D!" Sometimes, the "Project.D II" sound file is heard over the bumper or it is silent. Here are the featured bumpers:

Act 1: Encounter of Destiny
Intro Commercial: Takumi Fujiwara and his Toyota AE86

Back to the show: Itsuki and his Toyota AE85.

Act 2: The New Battlefield
Intro Commercial: Keisuke Takahashi and his yellow RE Amemiya Mazda RX-7 (FD3S)

Back to the show: Kobayakawa and his Mitsubishi Lancer Evolution VII (CP9A)

Act 3: Dead Line
Intro Commercial: Satoshi Omiya and his Mazda Roadster RS (NB8C)

Back to the show: Takumi Fujiwara and his Toyota Sprinter Trueno GT-APEX (AE86)

Act 4: Revenge Battle of Fate
Intro Commercial: Takumi and his Toyota Sprinter Trueno GT-APEX (AE86)

Back to the show: Kai Kogashiwa and his Toyota MR-S (ZZW30)

Act 5: Fujiwara Zone
Intro Commercial: Hideo Minagawa and his Toyota Supra

Back to the show: Keisuke and his RX-7 (FD3S)

Act 6: Keisuke's Determination
Intro Commercial: Same as Act. 1

Back to the show: Same as Act. 1

Act 7: Zero Hearts
Intro Commercial: Keisuke and his Mazda RX-7 (FD3S)

Back to the show: Ryuji Ikeda and his Nissan 350Z

Act 8: White Devil
Intro Commercial: Hiroya Okuyama and his Nissan Silvia Spec R Aero (S15)

Back to the show: Takumi and his Toyota Trueno (AE86)

Act 9: Shinigami
Intro Commercial: Rin Hojo and his Nissan Skyline GT-R (R32)

Back to the show: Ryosuke Takahashi and his Mazda SAVANNA RX-7 (FC3S)

Act 10: Full Stop
Intro Commercial: Same as the previous episode

Back to the show: Same as the previous episode

Act 11: Full Stop, Continued...
It is the same as Act 1 and Act 5 but in reverse order.

Intro Commercial: Itsuki and his Toyota AE85; this time, the announcer (presumably Itsuki) says "Initial D...YES!"

Back to the show: Takumi and his AE86

Act 12: Brothers
Intro Commercial: Same as Act 2, Act 5, and Act 7 but this time, the hood on Keisuke's RX-7 is black.

Back to the show: Go Hojo and his Honda NSX

Act 13: Unexpected Battle
Intro Commercial: Same as the previous episode.

Back to the show: Same as the previous episode

Act 14: Conclusion! Extreme Hill Climb
Intro Commercial: Same as before

Back to the show: Same as before

Initial D: Final Stage
The eyecatches are the same as before.

Act 1: Natural
Intro Commercial: Takumi Fujiwara and his Toyota Sprinter Trueno 2door GT-APEX (AE86)

Back to the show: Shinji Inui and his Toyota AE86

Act 2: The Strongest Enemy
Intro Commercial: Kyoichi Sudo and his Mitsubishi Lancer Evolution III CE9A

Back to the show: Daiki Ninomiya and his Honda Civic Type-R (EK9)

Act 3: Dead Line
Intro Commercial: Mako Sato and Sayuki of Impact Blue with their Nissan SilEighty

Back to the show: Bunta Fujiwara and his Subaru Impreza WRX STI GC8

Act 4: Dream
Intro Commercial: Members of Project D and their signature cars

Back to the show: Members of Sidewinder and their cars