Corrections for Katherine Nystrom's review

Thanks for taking time to review my proposal, I really appreciate it!

Here is an update about the corrections that had been done:

Typos
- change "smoothly drive" to "drive smoothly"

Rephrased, thanks!

- p. 5 "somewhat become easier" to "become somewhat easier"

Rephrased, thanks!

- p. 6 "in" should be "is" in "harmonizing speed limit signs in not exactly a complete traffic control system"

Great catch!

- p. 7 add the word "of" to "variety techniques"

Another great catch! Thanks!

- p. 11 "team meeting" should be "team meetings"

Corrected, thanks again!