ax said:
This one might not be just coincidence lex,
Road, Rue, Raad, 路 「ろ」、「lu4」
These are wonderful comparisons, アクス!
The French and the Japanese are so close, and the Chinese is not that far off either. Going back in time, furthermore, your question raises some interesting questions.
Aside from random coincidence, your suspicion of a global root for "road," I think, deserves some attention. I should probably have to look up OED to get the accepted English etymology, but I looked up
The Amrican Heritage Dictionary of Indo-European Roots (Calvert Watkins, 1985, Houghton Mifflin Co., p. 23) which says *ghredh- "to walk, to go." May or may not be the origin of "road," however. Waiting for updates on this.
The phonetic component 各 [ky: おのおの;oy: G. & K. かく, かっ] /ge4/ "each, every" is suspected to have an old *KL- initial. The turtle shell script of it is a pictograph of the human right foot 夂 (seen from top, with the big toe pointing downwards, see 夂 here
mythes et légendes) entering a cave or a pit dwelling 口. You can find a sample interpretation of 各 mid-page here.
说文解字话甲骨 Sorry, couldn't find anything in Japanese or English yet.
各 compounds retaining the *K- initial: 客, 格, 貉, 狢, 挌, 骼, 恪, 閣, 胳
各 compounds retaining the *L- initial: 路, 略, 輅, 洛, 落, 酪, 駱, 烙, 雒, 鮥
Other primary graphs and compounds suspected to have both the *KL- initial and the sense of "road, street, road-side quarters" are: 街, 衢, 逵, 行, 巷, 港. Laurant Sagart seems to see the /*K-/ as an Old Chinese prefix, reconstructing 路 as /*Ce-lak-s/ > *luH, where "C" stands for some undetermined consonant, and "e" for the schwa. The theory I'm quoting is from Choi, Yong Ai.
Mod. Kor. has /ko2ri/ for "broad street," /kil/ for "road." I'm interested in more examples from Japanese and other languages that either show a /kl~kr-/, /k-/, or /l~r-/ initial for the sense of "road, street, walk, enter, descend, dwelling, or cave."
Edit: 路 「ky: みち, じ; oy: G. ru, K. ro」 "road, on one's way, the Way, a means"
I wonder what the Middle Japanese or Old Japanese forms are for the modern Japanese /michi/ or /ji/?
Edit2:
Laurant Sagart,
The Roots of Old Chinese, 1999, gives the following Old Chinese reconstructions. OC > MC > Mandarin
各 *[A]k-lak > *kak > ge4 "enter" (p. 128)
骼 *[A]kr-lak> *kaek> ge1 "hind-leg, haunch"
骼 *[A]k-lak > *kak > ge1 "hind-leg, haunch"
落 *[A]ke-lak> *lak > luo4 "to fall, for tree leaves"
貉 *[A]Nk-lak> *hak> he2 "badger, marmot"
胳 *[A]k-lak > *kak > ge1 "armpit" (p. 125)
路 *[A]Ce-lak-s>*luH> lu4 "great"
酪 *[A]rak > *lak > lao4 "kumiss, fermented drink, (late borrowing) < arak, alcohol"
輅 *[A]ngra(k)-s > *ngaeH > ya4 "meet"
逵 *[*]Kwru > *gwij > kui2 "where several roads meet, thoroughfare"
[A] and [*] refers to Pulleyblank's distinction of sounds; nature unclear.
Zhou Fa Gao,
The Pronuncing Dictionary of Chinese Characters, 1989, says
街 *kreγ > *kei > jie1 "avenue"
行 *grang> *γrang > xing2 "row, street"
巷 *grewng > *γong > xiang4 "street"
For the last three and other characters not listed here, one should consult William Baxter's
A Handbook of Old Chinese Phonology, 1992, Berlin, Mouton de Gruyter.