Если стекло чистое и дворники работают хорошо, полиция реже останавливает меня, а я легче держу дистанцию и вовремя замечаю пешеходов.

Если introduces a conditional clause: “If …”. Everything up to the comma (Если стекло чистое и дворники работают хорошо,) is the condition, and what follows is the result/main clause.

In Russian, when an если-clause comes first, it’s normally separated from the main clause by a comma:

• Если …, (то) … The word то (“then”) is optional and is not used here.

Russian usually omits the present-tense form of “to be” (есть) in simple statements. So:

• стекло чистое = “the glass is clean” This is a common “zero-copula” construction in the present tense.

чистое is the long form (neuter singular). In predicate position (after the noun), both long and short forms can appear, but they differ in style/nuance:

• Long form (стекло чистое) is very common and often sounds neutral/descriptive.
• Short form would be стекло чисто, which can sound a bit more “categorical” or concise. Both can work; this sentence uses the long form.

Because the sentence is describing how they work, not what they are like as objects.

• работают хорошо = “work well” (adverb modifies the verb)
• дворники хорошие = “the wipers are good (quality)” (adjective describes the noun) Here the focus is on performance while working.

реже means “less often / more rarely.” It’s a comparative adverb from редко (“rarely”). It implies a comparison to the usual situation: the police stop me less often (than they otherwise would).

In Russian, полиция is a singular noun, so it takes a singular verb:

• полиция останавливает (3rd person singular) English treats “police” as plural, but Russian doesn’t.

останавливает (imperfective) is used for habitual/repeated situations: “(they) stop me (in general / from time to time).” Perfective остановит would sound more like a single future event: “will stop (me) (once).” This sentence describes a general pattern.

а often signals a contrast or shift of focus: “whereas / and (in contrast) / while.” Here it separates two results:

• result involving the police
• result involving “me” and my driving behavior Using и would sound more like simple addition with less contrast.

It’s accusative plural, because it’s the direct object of замечаю (“I notice”). For animate plural nouns, Russian accusative equals genitive in form:

• nominative plural: пешеходы
• accusative plural (animate): пешеходов

Both are adverbs:

• легче modifies держу: легче держу дистанцию = “I keep distance more easily”
• вовремя modifies замечаю: вовремя замечаю = “I notice in time / promptly”