even where = even if ???

"even" is an adverb, with a meaning for emphasizing something unexpected or surprising. (用於加強語氣) 解作 "甚至; 連"

"even" can be combined with some other (subordinating) conjunction to connect subordinate clauses (mainly adverb clause); such as, even if, even though, even when, and etc.

even if = even though = 即使; 雖然 (to describe "concession" relationship) 主句和從句之間的關係
even when = 就算當, 甚至當 (to describe "time" relationship)
even where = 甚至/就算 那裡的 (to describe "place" relationship)

1. Cyclists should not be allowed to ride on pavements, even where roads are very busy.
譯為：騎單車者不應該被允許在人行道上騎單車，就算那裡的道路是非常繁忙的。
= xxxxx, where roads are busy + xxxxx, where roads are not busy

In the above sentence, "even where" can be replaced by "even if", but the meaning is literally different from the original sentence.
(= xxxxx, if roads are busy + xxxxx, if roads are not busy)

2. He will come on time, even if it rains.
譯為：他會準時來的，即使下雨。

In the above sentence, "even if" cannot be replaced by "even where", because "he will come on time, where it rains" doesn't make sense.

2012-06-29 23:32:48 補充：
"where" can sometimes be used to express "situation" rather than "place".
Therefore, (1) can be intrepreted as "under the situation that roads are busy" in addition to "in the place which roads are busy". In that case, "even if" is very close in meaning to "even where".

Br Eng pavement means walking path.
Am.Eng pavement means road Motor way.

roads = 馬路
pavements = 行人路

基於以上事實，你對even where 的理解明顯站不住腳。

1. 不太能理解你的話, "Cyclists should not be allowed to ride on pavements, even where roads are very busy." 好像不通順啊...
"即使道路繁忙, 也不能讓人在道路上踏單車" >> 應該是 "即使道路 [不] 繁忙" 吧...

anyway, even where 的意思應該不是即使吧... 我沒有見過其他人這樣表達 "即使" 呢...
這裡只有 even 是解作 "即使", 而 where 是關係詞, 指前面的 pavements.
"even where roads are very busy" 意思是 "即使該處(pavements)的道路繁忙".

2. 同理, 所以 "He will come on time even where it rains" 是不合文法/邏輯的.
這裡的 where 是不需要的, 前面沒有東西能讓 where 起到關係的作用.

2012-06-29 21:39:23 補充：
你可以參加一下:

Q: She played games with them every day, even games where they had to play roles of family members.
even games where咩意思？

A: even 甚至、即使是
where 是連接詞 (conjunction)，意思不是「那裏」，而是「在其中」。

將句子簡單寫成這樣：
She played games where they had to play roles of family members.
where 的「在其中」便是解「在遊戲中」。

2012-06-29 21:40:35 補充：
sorry, there's a typing mistake. It should be 參考 instead of 參加.

2012-07-01 16:37:55 補充：
I apologize for my misunderstanding.
Yet, what you've said (行人路) is in British English.
For American English, pavement means 車道.