Collins Chinese Dictionary Plus (3rd edition), 2011:
eastbound [ˈiːstbaund]
adj
东(東)行的 dōngxíng de*
- Eastbound traffic is moving very slowly.
东行的交通非常拥(擁)堵。 Dōngxíng de jiāotōng fēicháng yōngdǔ.
- The car was eastbound on the M25.
汽车(車)在M25公路上向东行驶(駛)。 Qìchē zài M èrwu gōnglù shang xiàng dōng xíngshǐ.