In a similar comparison of E-modified (spaced to FHWA standards)
to ClearviewHwy 5-W, the length of the ClearviewHwy 5-W in this display of
the entire lowercase alphabet is 4.7% greater. The proportional length of
individual words will vary.
The design of ClearviewHwy 5-W-R is identical to ClearviewHwy 5-W, but has
reduced inter-letterspace that is approximately 6% less. ClearviewHwy 5-W-R
is designed for overhead freeway replacement panels only with overly wide legends
which cannot be accommodated by a panel that is currently at the maximum possible
width. Research by the Texas Transportation Institute has shown that use of
ClearviewHwy 5-W-R is significantly better than E-modified, but is not as effective
as the recommended spacing specified for clearviewHwy 5-W. Use of ClearviewHwy
5-W-R is discouraged in locations in which the replacement panel may be slightly
wider to gain the greatest improvement in legibility.