Rearrange the parts to make a meaningful sentence.

P. written in small letters,

Q. the bridge was unsafe

R. warned visitors that

S. the notice, which was

Explanation

1. 01

   S names the subject and opens a "which" clause, completed by P and closed by a comma.

2. 02

   Then the notice's verb: R "warned visitors that", and "that" needs a clause: Q.

3. 03

   So the order is SPRQ: "The notice, which was written in small letters, warned visitors that the bridge was unsafe."