FreeGameDev

How about Evolution game mode?
Old, present, futuristic cars are exist.
Past, present, future tracks are exist.

Hmm. I would need more info about how would it look like and what would be there.
Seems very similar to Career mode, where actually you would start with slower cars and end with extreme cars and on difficult stunt tracks.

Here is a plan.

Past era tracks
A3-Canyon, A6-Cannon
C1-Hairpins, C3-Vast, C4-Sway, C6-Abyss
D1-Dunes, D4-SBridge, D6-HighJumps, D11-PersianCity, D14-JumpCrazy, D15-CityWall
F7-Blur, F15-ForestTrip
G1-Long
I2-Sandy, I8-Pharaoh
J1-Curly, J8-Round, J13-Tropic, J15-Swamp, J16-MudMad
M2-Bumps
O2-Mouse, O3-Air
T1-Autumn, T2-RedOakPark, T3-Orange, T4-Scary
V1-Dark, V2-Volcanic, V4-Spikeland, V8-Uncertain, V10-MtSulphur
W1-Cross, W5-Circles, W6-SnowyEights, W7-LJs-Mntn

Past era cars
OT, M3, FR4, HR, TC6, SZ

Present era tracks
Many tracks to select

Present era cars
LK4, 3S, S8, N1, FM, S1, ES, CT, 360, XZ

Future era tracks
R1-Mars, R2-Red, R3-Hot
V6-Crematoria, V7-Radioactive, V9-Craters
X1-Magic, X2-Swirl, X3-Cloud, X4-Pipeline, X5-PipeJumps, X6-Wild
Y1-CrystalMoon

Future era cars
UV, TW, TU

Sorry, I still can’t get any idea about the gameplay. What are the rules? When do you win? Are there medals? Is there a score? Is there “unlocking” of cars or not? And so on …

And why just 3 eras? We have so many tracks, so in 3 eras each era is going to be very full of tracks. More eras can’t hurt.

Besides, maybe the year of manufacture which all these cars finally has an use! :-)

Yeah exactly, I agree. Useless idea, if you don't answer all of those questions.
And I also can't see the difference between Career. This could be the same mode.

For evolution importantly past track and old car.
For career not importantly past track and old car (present track and old car - allowably).

Every era contain several levels.

Past era prizes - wood, stone, iron medal.
Present era prizes - bronze, silver, gold medal.
Future era prizes - green, red, blue crystal.

For career prizes - cups, licenses.